Stock Compensation Summary of stock option activity for the period (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, 2015	1,512,756
Options Granted (in shares)	208,200
Options Exercised, Shares (in shares)	(74,110)
Cancelled or Forfeited (in shares)	(21,234)
Outstanding at March 31, 2014 (in shares)	1,625,612
Exercisable at March 31, 2014 (in shares)	1,217,909
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at January 1, 2014 Average Price (in dollars per share)	$ 13.24
Options granted, average exercise price (in dollars per share)	$ 18.67
Options exercised, average exercise price (in dollars per share)	$ 12.42
Cancelled or forfeited, average exercise price (in dollars per share)	$ 18.64
Outstanding at March 31, 2014 Average Price (in dollars per share)	$ 13.91
Exercisable at March 31, 2014, Average Exercise Price (in dollars per share)	$ 12.35
Outstanding at March 31, 2014 Weighted Average Life	5 years 10 months 25 days
Exercisable at March 31, 2014, Weighted Average Life	4 years 8 months 27 days