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Common Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Common stock repurchases, value	$ 19,037	$ 34,066	$ 28,100
Treasury Stock [Member]
Common stock repurchases (in shares)	700,000	1,509,156	1,483,527
Common stock repurchases, value	$ 19,037	$ 34,066	$ 28,100
Common Stock [Member]
Employee stock plans (in shares)	608,227	2,075,385	544,366

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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- Definition

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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