Stock-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
RSUs forfeited in period		(5,000)
RSUs unvested, ending balance		559,000
Restricted Stock [Member]
Number of Shares
RSUs unvested, beginning balance	276,880	276,880	374,818	513,111
RSUs granted in period			123,328	179,893
RSUs vested in period	(276,880)		(168,243)	(293,273)
RSUs forfeited in period			(53,023)	(24,913)
RSUs unvested, ending balance	0		276,880	374,818
Weighted Average
RSUs, nonvested, weighted average grant date fair value, beginning (in USD per share)	$ 13.24	$ 13.24	$ 10.59	$ 6.75
RSUs granted in period, weighted average grant date fair value (in USD per share)			16.52	11.71
RSUs, vested in period, weighted average grant date fair value (in USD per share)	13.24		10.40	5.01
RSUs, forfeited in period, weighted average grant date fair value (in USD per share)			11.75	10.35
RSUs, nonvested, weighted average grant date fair value, beginning (in USD per share)			$ 13.24	$ 10.59
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]
Fair value of RSUs vested during period		$ 5,241	$ 2,921	$ 3,538
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]
RSUs grant date fair value prices, beginning (in USD per share)	7.00	$ 7.00	$ 7.00	$ 1.00
RSUs grant date fair value award prices (in USD per share)			16.00	11.00
RSUs grant date fair value, vested prices (in USD per share)	7.00		7.00	1.00
RSUs grant date fair value, forfeited prices (in USD per share)			9.00	9.00
RSUs grant date fair value prices, ending (in USD per share)			7.00	7.00
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Amount Per Share [Abstract]
RSUs grant date fair value prices, beginning (in USD per share)	22.00	$ 22.00	20.00	11.00
RSUs grant date fair value award prices (in USD per share)			22.00	20.00
RSUs grant date fair value, vested prices (in USD per share)	$ 22.00		20.00	12.00
RSUs grant date fair value, forfeited prices (in USD per share)			18.00	12.00
RSUs grant date fair value prices, ending (in USD per share)			$ 22.00	$ 20.00