Net Income (Loss) per Share (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Income (Loss) per Share [Abstract]
Net income (loss)	[1]	$ 5,144	$ (5,768)	$ 19,588	$ 826
Less earnings allocated to RSUs		(155)		(595)	(23)
Net income (loss) available to common shareholders		$ 4,989	$ (5,768)	$ 18,993	$ 803

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