Stock-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 07, 2014	Jul. 24, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Weighted Average Grant Date Fair Value
Non-cash share compensation					$ 1,944	$ 860
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 (in dollars)		$ 2,900			$ 2,100		$ 2,100
Vesting period		3 years					1 year
Shares
Non-vested at the beginning of the period					319,654
Granted (in shares)		250,000			129,277		152,987
Vested (in shares)					(74,884)
Non-vested at the end of the period			374,047		374,047		319,654
Weighted Average Grant Date Fair Value
Non-vested at beginning of period					$ 12.60
Grant date value (in dollars per share)		$ 11.50			16.18
Vested (in dollars per share)					13.47
Non-vested at the end of period			$ 13.66		$ 13.66		$ 12.60
Non-cash share compensation			$ 800	$ 500	$ 1,500	$ 900
Unrecognized compensation expense			$ 3,000		$ 3,000
Initial estimated cumulative forfeiture rate (as a percent)					0.00%
2013 Plan | Restricted common shares | Management
Stock-based compensation
Vesting period					1 year
2013 Plan | Restricted common shares | Trust Employees
Stock-based compensation
Vesting period					3 years