Stock-Based Compensation - Summary of Stock Options Outstanding (Details) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock options outstanding, Beginning of period	160,748	309,479
Number of stock options outstanding, Expired	(2,500)	(131,250)
Number of stock options outstanding, Canceled or forfeited		(14,000)
Number of stock options outstanding, End of period	158,248	164,229
Number of stock options outstanding, Exercisable	133,665	117,564
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	$ 34.01