Net Income (Loss) per Share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Income (Loss) per Share [Abstract]
Net income	$ 6,162	$ 7,591
Less earnings allocated to RSUs	(125)	(263)
Net income (loss) available to common shareholders	$ 6,037	$ 7,328