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Stock Based Compensation - Excess Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share Based Compensation [Abstract]
Excess Tax Benefit From Stock Option Exercises	$ 369	$ 1,252
Excess Tax Benefit Related to Stock Option Exercises, Cash Flow	$ 369	$ 546

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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