Stock-based Compensation - Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Aug. 07, 2014	Jul. 24, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted Average Grant Date Fair Value
Non-cash share compensation			$ 3,798	$ 2,422	$ 433
2013 Plan | Restricted common shares
Stock-based compensation
Maximum number of shares authorized	2,450,000	600,000
Increase in number of common shares authorized for issuance	1,850,000
Grant date value		$ 2,900	$ 2,600	$ 2,100
Vesting period		3 years	3 years
Shares
Non-vested at the beginning of the period (in shares)			319,654	250,000
Granted (in shares)		250,000	162,522	152,987
Vested (in shares)			(170,337)	(83,333)
Non-vested at the beginning of the period (in shares)		250,000	311,839	319,654	250,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)			$ 12.60	$ 11.50
Grant date value (in dollars per share)		$ 11.50	15.95	13.79
Vested (in dollars per share)			12.93	11.50
Non-vested at beginning of period (in dollars per share)		$ 11.50	$ 14.17	$ 12.60	$ 11.50
Non-cash share compensation			$ 2,900	$ 2,200	$ 400
Unrecognized compensation expense			$ 2,100	$ 2,400	$ 2,500
Initial estimated cumulative forfeiture rate (as a percent)			0.00%
Minimum | 2013 Plan | Restricted common shares
Stock-based compensation
Vesting period			1 year	1 year
Maximum | 2013 Plan | Restricted common shares
Stock-based compensation
Vesting period				3 years