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, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31 (in shares)	1,574,572	1,919,021
Outstanding at December 31, Average Price (in dollars per share)	$ 12.14
Options Granted (in shares)	209,500	323,400	323,950
Options Granted, Average Exercise Price (in dollars per share)	$ 20.93	$ 14.77	$ 12.96
Options Exercised, Shares (in shares)	(228,064)	(503,321)	(288,794)
Options Exercised, Average Exercise Price (in dollars per share)	$ 12.20
Cancelled or Forfeited (in shares)	(43,252)	(164,528)	(113,913)
Cancelled or Forfeited, Average Exercise Price (in dollars per share)	$ 15.74
Outstanding at December 31 (in shares)	1,512,756	1,574,572	1,919,021
Outstanding at December 31, Average Price (in dollars per share)	$ 13.24	$ 12.14
Outstanding at December 31, Weighted Average Life (in years)	5 years 0 months 29 days
Aggregate Intrinsic Value December 31	$ 6,590
Exercisable at December 31 (in shares)	1,066,219	1,057,694	1,355,112
Exercisable at December 31, Average Exercise Price (in dollars per share)	$ 11.58	$ 11.48	$ 11.63
Weighted Average Life, exercisable	4 years 5 months 19 days
Aggregate Intrinsic Value, exercisable	$ 6,420
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
Options Exercised, Average Exercise Price (in dollars per share)	$ 9.97	$ 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
Options Exercised, Average Exercise Price (in dollars per share)	$ 17.02	$ 18.62	$ 12.55