Share-Based Compensation (Details 3) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options	284
Weighted average remaining contractual term (in years)	1.76
Weighted average exercise price (price per share)	$ 14.62
Number of exercisable options	284
Weighted average exercise price, exercisable options	$ 14.62
Stock options exercise price lower range limit (price per share)	$ 10.33
Stock options exercise price upper range limit (price per share)	$ 27.50
Range of Exercise Price $10.33 to $14.88 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options	214
Weighted average remaining contractual term (in years)	1.89
Weighted average exercise price (price per share)	$ 13.00
Number of exercisable options	214
Weighted average exercise price, exercisable options	$ 13.00
Stock options exercise price lower range limit (price per share)	$ 10.33
Stock options exercise price upper range limit (price per share)	$ 14.88
Range of Exercise Price $16.80 to $17.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options	51
Weighted average remaining contractual term (in years)	1.72
Weighted average exercise price (price per share)	$ 16.81
Number of exercisable options	51
Weighted average exercise price, exercisable options	$ 16.81
Stock options exercise price lower range limit (price per share)	$ 16.80
Stock options exercise price upper range limit (price per share)	$ 17.00
Range of Exercise Price $25.33 to $27.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options	19
Weighted average remaining contractual term (in years)	0.40
Weighted average exercise price (price per share)	$ 26.94
Number of exercisable options	19
Weighted average exercise price, exercisable options	$ 26.94
Stock options exercise price lower range limit (price per share)	$ 25.33
Stock options exercise price upper range limit (price per share)	$ 27.50