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Common stock represent the ownership interest in a 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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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This element refers to the Gain included in earnings and not to the cash proceeds of the 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-01","end":"2015-12-31","val":20895000,"accn":"0001254595-16-000101","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22"},{"start":"2015-01-01","end":"2015-12-31","val":20895000,"accn":"0001254595-17-000014","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":11863000,"accn":"0001254595-17-000014","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-24","frame":"CY2016"}]}},"PaymentsForProceedsFromProductiveAssets":{"label":"Payments 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Issued During Period, Value, Stock Options Exercised","description":"Value of stock issued as a result of the exercise of stock 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or Unit Option Plan Expense","description":"Amount of noncash expense for option under share-based payment 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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":"2014-01-01","end":"2014-09-30","val":0,"accn":"0001254595-15-000071","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"start":"2015-01-01","end":"2015-09-30","val":-10180000,"accn":"0001254595-15-000071","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30"},{"start":"2015-07-01","end":"2015-09-30","val":10200000,"accn":"0001254595-15-000071","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3"},{"start":"2015-01-01","end":"2015-12-31","val":10180000,"accn":"0001254595-16-000101","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22","frame":"CY2015"}]}},"StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased":{"label":"Stock Repurchase Program, Number of Shares Authorized to be Repurchased","description":"The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.","units":{"shares":[{"end":"2015-06-30","val":5000000,"accn":"0001254595-15-000053","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-31","frame":"CY2015Q2I"},{"end":"2015-09-30","val":5000000,"accn":"0001254595-15-000071","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-30","frame":"CY2015Q3I"},{"end":"2015-12-31","val":5000000,"accn":"0001254595-16-000101","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-22","frame":"CY2015Q4I"}]}},"StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased":{"label":"Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased","description":"The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase 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Equity, Carrying Amount (Deprecated 2012-01-31)","description":"The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders 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. 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 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":"2010-12-31","val":16122000,"accn":"0001193125-12-240154","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-05-18","frame":"CY2010Q4I"},{"end":"2010-12-31","val":16122000,"accn":"0001193125-12-235035","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-03-31","val":37420000,"accn":"0001193125-12-240154","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-05-18","frame":"CY2011Q1I"},{"end":"2011-03-31","val":37420000,"accn":"0001193125-12-235035","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2011-12-31","val":39981000,"accn":"0001193125-12-240154","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-05-18","frame":"CY2011Q4I"},{"end":"2011-12-31","val":39981000,"accn":"0001193125-12-235035","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"},{"end":"2012-03-31","val":40044000,"accn":"0001193125-12-240154","fy":2012,"fp":"Q1","form":"10-Q/A","filed":"2012-05-18","frame":"CY2012Q1I"},{"end":"2012-03-31","val":40044000,"accn":"0001193125-12-235035","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15"}]}},"TemporaryEquityCarryingAmountAttributableToParent":{"label":"Temporary Equity, Carrying Amount, Attributable to Parent","description":"Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. 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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 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