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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Stockholders' Equity [Abstract]
Interest rate swap, tax	$ 1,163	$ (1,152)	$ (645)
Treasury stock, shares of common stock (in shares)	2,164,986	3,033,733	637,710
Retirement of treasury shares (in shares)	(2,164,986)	(3,136,833)	(534,610)
Exercise and lapse of share-based awards, tax benefit	$ 4,487	$ 3,118	$ 1,877

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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