Stock Compensation - Stock Compensation Summary of stock option activity for the period (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2011 (in shares)	1,997,778	1,845,210
Outstanding at December 31, 2011 Average Price (in dollars per share)	$ 11.33
Options Granted (in shares)	323,950	365,025	345,600
Options Granted, Average Exercise Price (in dollars per share)	$ 12.96
Options Exercised, Shares (in shares)	(288,794)	(59,031)	(5,650)
Options Exercised, Average Exercise Price (in dollars per share)	$ 16.22		$ 8.00
Cancelled or Forfeited (in shares)	(113,913)	(153,426)	(175,909)
Cancelled or Forfeited, Average Exercise Price (in dollars per share)	$ 11.67
Outstanding at December 31, 2012 (in shares)	1,919,021	1,997,778	1,845,210
Outstanding at December 31, 2012 Average Price (in dollars per share)	$ 11.63	$ 11.33
Outstanding at December 31, 2012 Weighted Average Life (in years)	6 years 3 months 17 days
Aggregate Intrinsic Value December 31, 2012	$ 6,755
Exercisable at December 31, 2012 (in shares)	1,355,112	1,429,040	1,191,865
Exercisable at December 31, 2012, Average Exercise Price (in dollars per share)	$ 11.63	$ 11.75	$ 12.21
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	5 years 3 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 4,770
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Granted, Average Exercise Price (in dollars per share)		$ 10.10	$ 9.97
Options Exercised, Average Exercise Price (in dollars per share)	$ 8.00	$ 8.00
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Granted, Average Exercise Price (in dollars per share)		$ 10.28	$ 12.46
Options Exercised, Average Exercise Price (in dollars per share)	$ 12.55	$ 12.55