Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Changes in Stockholders' Equity [Abstract]
Interest rate swap, tax	$ 1,152	$ 645	$ 1,299
Treasury stock, shares of common stock (in shares)	3,033,733	637,710	48,970
Retirement of treasury shares (in shares)	(3,136,833)	(534,610)	(48,970)
Exercise and lapse of share-based awards, tax benefit	$ 3,118	$ 1,877	$ 2,408

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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Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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