Stock-Based Compensation - Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested in period, fair value	$ 2,400
Vested in period (in shares)	176,665	0
Number of Shares (in shares)
Outstanding at beginning of period (in shares)	600,025
Granted (in shares)	311,612
Forfeited (in shares)	0
Vested (in shares)	(176,665)	0
Outstanding at end of period (in shares)	734,972
Weighted- Average Grant Date Fair Value (in dollars per share)
Outstanding at December 31, 2015 (in dollars per share)	$ 13.38
Granted (in dollars per share)	15.55
Forfeited (in dollars per share)	0.00
Vested (in dollars per share)	13.40
Outstanding at March 31, 2016 (in dollars per share)	$ 14.29
Aggregate intrinsic value	$ 8,562		$ 10,542
Unrecognized compensation expense	$ 9,100
Unrecognized compensation expense, period for recognition (years)	2 years 3 months 18 days
Restricted Stock | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	3 years
Restricted stock awards | Non-employee Members, Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (years)	1 year