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Stock-Based Compensation (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
SOSARs [Member]
Compensation expense for the periods
Compensation expense	$ 369	$ 357	$ 1,095	$ 1,237
Restricted Stock Units and Performance Share Awards [Member]
Compensation expense for the periods
Compensation expense	$ 680	$ 534	$ 1,959	$ 1,541

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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