Stock-Based Incentive Plans Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 Y
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2010	521,000
Options, exercised	(87,000)
Outstanding at December 31, 2011	434,000
Options, Vested	434,000
Exercisable at December 31, 2011	434,000
Outstanding, weighted average exercise price, period start	$ 5.41
Options, Exercised, Weighted Average Exercise Price	$ 4.73
Outstanding, weighted average exercise price, period end	$ 5.55
Options, Vested, Weighted Average Exercise Price	$ 5.55
Options, Exercisable, Weighted Average Exercise Price	$ 5.55
Options, Outstanding, Weighted Average Remaining Contractual Term	2.8
Options, Vested, Weighted Average Remaining Contractual Term	2.8
Options, Exercisable, Weighted Average Remaining Contractual Term	2.8
Options Outstanding, Aggregate, Intrinsic Value	$ 13,442,000
Options, Vested, Aggregate Intrinsic Value	13,442,000
Options, Exercisable, Aggregate Intrinsic Value	$ 13,442,000