Stock Based Compensation - Summary of Stock Options Outstanding (Details) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock options outanding, Beginning of period	160,748	309,479
Number of stock options outanding, Expired	(2,500)	(131,250)
Number of stock options outanding, Canceled or forfeited		(14,000)
Number of stock options outanding, End of period	158,248	164,229
Number of stock options outanding, Exercisable	133,665	113,072
Weighted average exercise price, Beginning of period	$ 25.28	$ 19.75
Weighted average exercise price, Expired	$ 32.90	11.60
Weighted average exercise price, Canceled or forfeited		31.31
Weighted average exercise price, End of period	$ 25.06	25.28
Weighted average exercise price, Exercisable	$ 29.13	$ 35.20