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Stock-Based Compensation - Number and Weighted Average Grant Date Fair Value of Equity Awards Granted (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restricted Stock Units (RSUs) [Member]
Number of shares granted	261	137
Weighted average grant date fair value	$ 16.87	$ 17.71

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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