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Equity and Stock Based Compensation - Excess Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity and Stock-Based Compensation [Abstract]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 2,045	$ 109	$ 2,558
Excess tax benefit from stock option exercises	$ 2,045	$ 109	$ 2,558

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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