Stock Compensation - Summary of Stock Option Activity for the Period (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Granted (in shares)	271,350	208,200	209,500
Issuances under option plans, shares	334,836	239,508	228,064
Outstanding at December 31, 2015	1,409,881	1,512,756
Options Exercised, Shares (in shares)	(334,836)	(239,508)	(228,064)
Cancelled or forfeited (in shares)	(70,965)
Expired (in shares)	(91,600)
Outstanding at December 31, 2016	1,183,830	1,409,881	1,512,756
Exercisable at December 31, 2016	934,898	1,231,544	1,066,219
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options Granted, Average Exercise Price (in dollars per share)	$ 11.62	$ 18.67	$ 20.93
Options Exercised, Average Exercise Price (in dollars per share)	9.66
Outstanding, Average Price (in dollars per share)	14.12
Cancelled or forfeited, average exercise price (in dollars per share)	15.37
Expired, Average Exercise price (in dollars per share)	17.05
Outstanding, Average Price (in dollars per share)	14.50	14.12
Exercisable, Average Exercise Price (in dollars per share)	$ 14.88	13.47	11.58
Outstanding, Weighted Average Life	6 years 2 months 12 days
Exercisable, Weighted Average Life	5 years 5 months 19 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options Exercised, Average Exercise Price (in dollars per share)	$ 9.00	9.97	9.97
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options Exercised, Average Exercise Price (in dollars per share)	$ 14.77	$ 17.02	$ 17.02