Stock-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Number of Options
Outstanding on December 31, 2011	1,502,000
Granted	153,200
Exercised	(97,000)
Forfeited/cancelled/expired	(50,000)
Ending balance	1,508,000
Vested and expected to vest on ending	1,503,000
Exercisable on ending	1,230,000
Weighted-Average Exercise Price
Outstanding on December 31, 2011	$ 19.53
Granted	$ 19.92
Exercised	$ 14.63
Forfeited/cancelled/expired	$ 21.51
Outstanding on ending	$ 19.82
Vested and expected to vest on ending	$ 19.82
Exercisable on ending	$ 19.30
Weighted-Average Remaining Contractual Term
Outstanding at ending	4 years 10 months 6 days
Vested and expected to vest on ending	4 years 10 months 2 days
Exercisable on ending	4 years 15 days
Aggregate Intrinsic Value
Exercised	$ 277
Outstanding at ending	2,114
Value Vested and expected to vest on ending	2,109
Exercisable on ending	$ 2,043

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