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Stock-Based Compensation (Details 5) (Stock Appreciation Rights (SARs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Weighted average grant date of the SARs granted and the total intrinsic value of the SARs exercised
Number of SARs granted	259	215
Weighted average grant-date fair value	$ 5.97	$ 7.10
Intrinsic value of SARs exercised		$ 591
Fair value of vested	$ 1,388

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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