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Stock-Based Compensation - Changes in Capital Surplus (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 1,876	$ 2,744	$ 3,828	$ 5,398
Shares withheld for taxes	(2)	(92)	(332)	(220)
Capital surplus increase	$ 1,874	$ 2,652	$ 3,496	$ 5,178

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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