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Stock-Based Compensation - Changes in Capital Surplus (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation	$ 1,856	$ 1,952
Shares withheld for taxes	(227)	(330)
Capital surplus increase	$ 1,629	$ 1,622

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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