Stock-Based Compensation - Non-Vested Stock Options Rollforward (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Share-Based Compensation Arrangement by Share Based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested stock options, beginning of year, number of shares	733,906
Nonvested stock options, granted, number of shares	0
Nonvested stock options, vested, number of shares	(348,506)
Nonvested stock options, forfeited, number of shares	(30,378)
Nonvested stock options, end of year, number of shares	355,022
Share-Based Compensation Arrangement by Share Based Payment Award, Options, Nonvested, Weighted-Average Grant Date Fair Value [Roll Forward]
Nonvested stock options, beginning of period, weighted-average grant date fair value	$ 3.78
Nonvested stock options, granted, weighted-average grant date fair value
Nonvested stock options, vested, weighted-average grant date fair value	$ 3.94
Nonvested stock options, forfeited, weighted-average grant date fair value	$ 3.70
Nonvested stock options, end of period, weighted-average grant date fair value	$ 3.62