Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of a stock repurchase plan authorized by an entity's Board of Directors.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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Shareholders' Equity-Common Stock Rollforward (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2014	May 31, 2014	Jul. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Repurchases of common stock				2,189,966us-gaap_TreasuryStockSharesAcquired	6,227,341us-gaap_TreasuryStockSharesAcquired
Preferred Stock, Shares Authorized	2,000,000us-gaap_PreferredStockSharesAuthorized			2,000,000us-gaap_PreferredStockSharesAuthorized	2,000,000us-gaap_PreferredStockSharesAuthorized
Stock Repurchase Program, Authorized Amount	$ 200,000	$ 200,000	$ 200,000		$ 400,000
Treasury Stock, Value, Acquired, Cost Method				$ 115,197	$ 338,756
Common Stock Issued [Member]
Common stock outstanding, Beginning balance					125,424	125,424	125,382
Shares issued for stock-based compensation awards					0	0	42
Repurchases of common stock					0	0	0
Common stock outstanding, Ending balance	125,424			125,424	125,424	125,424	125,424
Treasury Stock [Member]
Common stock outstanding, Beginning balance					25,488	19,423	13,568
Shares issued for stock-based compensation awards					(1,506)	(2,772)	(1,326)
Repurchases of common stock					5,547	8,837	7,181
Common stock outstanding, Ending balance	29,529			29,529	29,529	25,488	19,423
Common Stock at Par Value [Member]
Common stock outstanding, Beginning balance					99,936	106,001	111,814
Shares issued for stock-based compensation awards					1,506	(2,772)	1,368
Repurchases of common stock					(5,547)	(8,837)	(7,181)
Common stock outstanding, Ending balance	95,895			95,895	95,895	99,936	106,001