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Excludes cash and cash equivalents within disposal group and discontinued 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2008-12-31","val":65884000,"accn":"0001104659-12-014371","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2008Q4I"},{"end":"2009-12-31","val":72969000,"accn":"0001104659-12-014371","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009Q4I"},{"end":"2009-12-31","val":72969000,"accn":"0001104659-11-062160","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2009-12-31","val":72969000,"accn":"0001104659-11-044685","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2010-06-30","val":112717000,"accn":"0001104659-11-044685","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2010Q2I"},{"end":"2010-09-30","val":131728000,"accn":"0001104659-11-062160","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08","frame":"CY2010Q3I"},{"end":"2010-12-31","val":150117000,"accn":"0001115836-12-000003","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-05","frame":"CY2010Q4I"},{"end":"2010-12-31","val":150545000,"accn":"0001104659-12-055602","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2010-12-31","val":150829000,"accn":"0001104659-12-034767","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2010-12-31","val":150829000,"accn":"0001104659-12-014371","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2010-12-31","val":150829000,"accn":"0001104659-11-062160","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2010-12-31","val":150829000,"accn":"0001104659-11-044685","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-03-31","val":117523000,"accn":"0001104659-12-034767","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2011Q1I"},{"end":"2011-06-30","val":113743000,"accn":"0001104659-12-055602","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2011Q2I"},{"end":"2011-06-30","val":114027000,"accn":"0001104659-11-044685","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-09-30","val":118653000,"accn":"0001115836-12-000003","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-05","frame":"CY2011Q3I"},{"end":"2011-09-30","val":119536000,"accn":"0001104659-11-062160","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-08"},{"end":"2011-12-31","val":90104000,"accn":"0001115836-12-000003","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-05","frame":"CY2011Q4I"},{"end":"2011-12-31","val":90317000,"accn":"0001104659-12-055602","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08"},{"end":"2011-12-31","val":90323000,"accn":"0001104659-12-034767","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":90323000,"accn":"0001104659-12-014371","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2012-03-31","val":66724000,"accn":"0001104659-12-034767","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"},{"end":"2012-06-30","val":71562000,"accn":"0001104659-12-055602","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-08","frame":"CY2012Q2I"},{"end":"2012-09-30","val":101536000,"accn":"0001115836-12-000003","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-05","frame":"CY2012Q3I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. 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Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2017-12-31","val":184075000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2017Q4I"},{"end":"2018-12-31","val":111884000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2015-12-31","val":138916000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2015Q4I"},{"end":"2016-12-31","val":156010000,"accn":"0001115836-18-000015","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2016-12-31","val":156010000,"accn":"0001115836-18-000025","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2016-12-31","val":153425000,"accn":"0001115836-18-000029","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2016-12-31","val":156010000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2016Q4I"},{"end":"2017-03-31","val":138682000,"accn":"0001115836-18-000015","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2017Q1I"},{"end":"2017-06-30","val":125214000,"accn":"0001115836-18-000025","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":209898000,"accn":"0001115836-18-000029","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2017Q3I"},{"end":"2017-12-31","val":184075000,"accn":"0001115836-18-000015","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09"},{"end":"2017-12-31","val":184075000,"accn":"0001115836-18-000025","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2017-12-31","val":184075000,"accn":"0001115836-18-000029","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07"},{"end":"2017-12-31","val":184075000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2017Q4I"},{"end":"2018-03-31","val":141824000,"accn":"0001115836-18-000015","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-09","frame":"CY2018Q1I"},{"end":"2018-06-30","val":169276000,"accn":"0001115836-18-000025","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2018Q2I"},{"end":"2018-09-30","val":150212000,"accn":"0001115836-18-000029","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-07","frame":"CY2018Q3I"},{"end":"2018-12-31","val":111884000,"accn":"0001115836-19-000004","fy":2018,"fp":"FY","form":"10-K","filed":"2019-02-28","frame":"CY2018Q4I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect","description":"Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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anFairValueOfPlanAssets":{"label":"Defined 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May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as 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This item includes treasury stock repurchased by the entity. 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Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, 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