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Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.","units":{"USD":[{"end":"2012-06-30","val":8615000,"accn":"0001171843-12-003132","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-09-30","val":9177000,"accn":"0001171843-12-004170","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-14","frame":"CY2012Q3I"},{"end":"2012-12-31","val":8434944,"accn":"0001171843-13-001043","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-03-31","val":5826000,"accn":"0001171843-13-002021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"}]}},"AvailableForSaleSecuritiesGrossUnrealizedGains":{"label":"Available-for-sale Securities, Gross Unrealized Gain","description":"Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.","units":{"USD":[{"start":"2013-01-01","end":"2013-09-30","val":1000,"accn":"0001171843-13-004659","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"start":"2013-01-01","end":"2013-12-31","val":667,"accn":"0001171843-14-001480","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"},{"start":"2013-01-01","end":"2013-12-31","val":667,"accn":"0001171843-15-001466","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-17","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":1000,"accn":"0001171843-14-002370","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-12-31","val":58,"accn":"0001171843-16-008443","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-08","frame":"CY2014"}]}},"AvailableForSaleSecuritiesGrossUnrealizedLoss":{"label":"Available-for-sale Securities, Gross Unrealized Loss","description":"Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.","units":{"USD":[{"start":"2013-01-01","end":"2013-06-30","val":-1000,"accn":"0001171843-13-003403","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-14"},{"start":"2013-01-01","end":"2013-12-31","val":-779,"accn":"0001171843-14-001480","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"},{"start":"2013-01-01","end":"2013-12-31","val":-1000,"accn":"0001171843-14-002370","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-14"},{"start":"2013-01-01","end":"2013-12-31","val":-1000,"accn":"0001171843-14-003880","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-11"},{"start":"2013-01-01","end":"2013-12-31","val":-1000,"accn":"0001171843-14-005463","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12","frame":"CY2013"},{"start":"2014-01-01","end":"2014-09-30","val":-1000,"accn":"0001171843-14-005463","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-12"}]}},"AvailableForSaleSecuritiesGrossUnrealizedLosses1":{"label":"Available-for-sale Securities, Gross Unrealized Losses (Deprecated 2013-01-31)","description":"This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"end":"2012-06-30","val":-1000,"accn":"0001171843-12-003132","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-14","frame":"CY2012Q2I"},{"end":"2012-12-31","val":-211,"accn":"0001171843-13-001043","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-03-31","val":-1000,"accn":"0001171843-13-002021","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-14","frame":"CY2013Q1I"}]}},"AvailableForSaleSecuritiesNoncurrent":{"label":"Available-for-sale Securities, Noncurrent","description":"Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. 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Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. 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125484,"accn":"0001171843-16-009819","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09"},{"end":"2015-12-31","val":7125484,"accn":"0001171843-16-011590","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08"},{"end":"2015-12-31","val":7125484,"accn":"0001171843-16-013037","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08"},{"end":"2015-12-31","val":7125484,"accn":"0001171843-17-001277","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-02","frame":"CY2015Q4I"},{"end":"2016-03-31","val":7125484,"accn":"0001171843-16-009819","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-09","frame":"CY2016Q1I"},{"end":"2016-06-30","val":7130956,"accn":"0001171843-16-011590","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08","frame":"CY2016Q2I"},{"end":"2016-09-30","val":7131956,"accn":"0001171843-16-013037","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-08","frame":"CY2016Q3I"},{"end":"2016-12-31","val":7137848,"accn":"0001171843-17-001277","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-02"},{"end":"2016-12-31","val":7137848,"accn":"0001171843-17-002804","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"end":"2016-12-31","val":7137848,"accn":"0001171843-17-004900","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":7137848,"accn":"0001171843-17-006997","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2016Q4I"},{"end":"2017-03-31","val":7212848,"accn":"0001171843-17-002804","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":7297893,"accn":"0001171843-17-004900","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":7322893,"accn":"0001171843-17-006997","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-14","frame":"CY2017Q3I"}]}},"CommonStockValue":{"label":"Common 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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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