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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":241150,"accn":"0001193125-13-119450","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-21","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":241150,"accn":"0001193125-12-115972","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-15"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2019-01-01","end":"2019-06-30","val":500000,"accn":"0001493152-19-012348","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-14"},{"start":"2019-01-01","end":"2019-09-30","val":500000,"accn":"0001493152-19-017399","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-14"}]}},"TangibleAssetImpairmentCharges":{"label":"Tangible Asset Impairment Charges","description":"The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":63000,"accn":"0001193125-13-119450","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-21","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":0,"accn":"0001193125-14-097773","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":28000,"accn":"0001193125-13-119450","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-21"},{"start":"2012-01-01","end":"2012-12-31","val":28000,"accn":"0001193125-14-097773","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13"},{"start":"2012-01-01","end":"2012-12-31","val":28000,"accn":"0001193125-15-091382","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001193125-14-097773","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-13"},{"start":"2013-01-01","end":"2013-12-31","val":0,"accn":"0001193125-15-091382","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001193125-15-091382","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-13"},{"start":"2014-01-01","end":"2014-12-31","val":0,"accn":"0001193125-16-504472","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":0,"accn":"0001193125-16-504472","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015"}]}},"TemporaryEquityAccretionToRedemptionValue":{"label":"Temporary Equity, Accretion to Redemption Value","description":"Value of accretion of temporary equity to its redemption value during the period.","units":{"USD":[{"start":"2017-01-01","end":"2017-03-31","val":500000,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":500000000,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"start":"2017-01-01","end":"2017-09-30","val":500000,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14"},{"start":"2017-01-01","end":"2017-12-31","val":500000,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":500000,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":500000,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"start":"2018-01-01","end":"2018-09-30","val":500000,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"start":"2018-01-01","end":"2018-12-31","val":500000,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":500000,"accn":"0001493152-19-007400","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-15","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":500000,"accn":"0001493152-19-012348","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-14"},{"start":"2019-01-01","end":"2019-09-30","val":500000,"accn":"0001493152-19-017399","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-14"}]}},"TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests":{"label":"Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests","description":"Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2016-12-31","val":500000,"accn":"0001493152-17-002678","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-21"},{"end":"2016-12-31","val":500000,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15"},{"end":"2016-12-31","val":500000,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"end":"2016-12-31","val":500000,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14"},{"end":"2016-12-31","val":500000,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":500000,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":500000,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":500000,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":500000,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"end":"2017-12-31","val":500000,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":500000,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":500000,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"end":"2017-12-31","val":500000,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017Q4I"},{"end":"2018-03-31","val":500000,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":500000,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":500000,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2018Q3I"}]}},"TemporaryEquityParOrStatedValuePerShare":{"label":"Temporary Equity, Par or Stated Value Per Share","description":"Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.","units":{"USD/shares":[{"end":"2016-12-31","val":0.01,"accn":"0001493152-17-002678","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-21"},{"end":"2016-12-31","val":0.01,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15"},{"end":"2016-12-31","val":0.01,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"end":"2016-12-31","val":0.01,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14"},{"end":"2016-12-31","val":0.01,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":0.01,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":0.01,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":0.01,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":0.01,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"end":"2017-12-31","val":0.01,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":0.01,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":0.01,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"end":"2017-12-31","val":0.01,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2017Q4I"},{"end":"2018-03-31","val":0.01,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":0.01,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":0.01,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0.01,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesIssued":{"label":"Temporary Equity, Shares Issued","description":"The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2016-12-31","val":10702838,"accn":"0001493152-17-002678","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-21"},{"end":"2016-12-31","val":10702838,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15"},{"end":"2016-12-31","val":10702838,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14"},{"end":"2016-12-31","val":10702838,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14"},{"end":"2016-12-31","val":10702838,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02","frame":"CY2016Q4I"},{"end":"2017-03-31","val":10702838,"accn":"0001493152-17-005363","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-15","frame":"CY2017Q1I"},{"end":"2017-06-30","val":10702838,"accn":"0001493152-17-009271","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-14","frame":"CY2017Q2I"},{"end":"2017-09-30","val":10702838,"accn":"0001493152-17-013222","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"},{"end":"2017-12-31","val":10702838,"accn":"0001493152-18-004562","fy":2017,"fp":"FY","form":"10-K","filed":"2018-04-02"},{"end":"2017-12-31","val":10702838,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15"},{"end":"2017-12-31","val":10702838,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14"},{"end":"2017-12-31","val":721107,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14"},{"end":"2017-12-31","val":721107,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01"},{"end":"2017-12-31","val":721107,"accn":"0001493152-19-007400","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-15"},{"end":"2017-12-31","val":721107,"accn":"0001493152-19-012348","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-14"},{"end":"2017-12-31","val":721107,"accn":"0001493152-19-017399","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-14"},{"end":"2017-12-31","val":721107,"accn":"0001493152-20-006338","fy":2019,"fp":"FY","form":"10-K","filed":"2020-04-14","frame":"CY2017Q4I"},{"end":"2018-03-31","val":10702838,"accn":"0001493152-18-006940","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-15","frame":"CY2018Q1I"},{"end":"2018-06-30","val":10702838,"accn":"0001493152-18-011667","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-14","frame":"CY2018Q2I"},{"end":"2018-09-30","val":721107,"accn":"0001493152-18-015985","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-14","frame":"CY2018Q3I"},{"end":"2018-12-31","val":0,"accn":"0001493152-19-004545","fy":2018,"fp":"FY","form":"10-K","filed":"2019-04-01","frame":"CY2018Q4I"}]}},"TemporaryEquitySharesOutstanding":{"label":"Temporary Equity, Shares Outstanding","description":"The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. 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