Net Income (Loss) per Share (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income (Loss) per Share [Abstract]
Net income (loss)	[1]	$ (23)	$ 389	$ 2,109	$ 7,803
(Earnings) loss allocated to RSUs		1	(16)	(49)	(304)
Net income (loss) available to common shareholders		$ (22)	$ 373	$ 2,060	$ 7,499

[1] There is no material difference between net income and comprehensive income.