Stock-Based Compensation Stock Appreciation Rights Activity (Details) (Amended and Restated 2004 Omnibus Stock Plan, Stock Appreciation Rights [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amended and Restated 2004 Omnibus Stock Plan | Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding ending balance (in shares)	857	695	586
Granted (in shares)	18	429	159
Exercised (in shares)	(79)	(22)	(7)
Canceled (in shares)	(69)	(136)	(38)
Expired (in shares)	(99)	(109)	(5)
Outstanding ending balance (in shares)	628	857	695
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted-Average Exercise Price, Begining Balance (in dollars per share)	$ 16.51	$ 19.47	$ 20.66
Granted, Weighted-Aberage Exercise Price (in dollars per share)	$ 14.99	$ 13.15	$ 14.80
Exercised, Weighted-Aberage Exercise Price (in dollars per share)	$ 10.88	$ 10.06	$ 9.61
Canceled, Weighted-Aberage Exercise Price (in dollars per share)	$ 13.38	$ 15.70	$ 19.43
Expired, Weighted-Aberage Exercise Price (in dollars per share)	$ 22.99	$ 24.49	$ 25.49
Outstanding, Weighted-Average Exercise Price, Ending Balance (in dollars per share)	$ 16.53	$ 16.51	$ 19.47
Outstanding at year end, Weighted-Average Remaing Contractual Life (in years)	3 years 9 months 18 days
Outstanding at December 31, 2012 Aggregate Intrinsic Value	$ 1,968
Exercisable at December 31, 2012 (in shares)	265
Exercisable at December 31, 2012, Weighted-Average Exercise Price (in dollars per share)	$ 20.63
Exercisable at December 31, 2012, Weighted-Average Remaing Contractual Life (in years)	2 years 4 months 24 days
Exercisable at December 31, 2012, Aggregate Intrinsic Value	438
Exercisable and expected to vest at December 31, 2012 (in shares)	527
Exercisable and expected to vest at December 31, 2012, Weighted-Average Exercise Price (in dollars per share)	$ 17.34
Exercisable and expected to vest at December 31, 2012, Weighted-Average Remainig Contractual Life (in years)	3 years 6 months
Exercisable and expected to vest at December 31, 2012, Aggregate Intrinsic Value	$ 1,448