Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income per Share [Abstract]
Net income	[1]	$ 4,322	$ 5,144	$ 16,337	$ 19,588
Less earnings allocated to RSUs		(115)	(155)	(429)	(595)
Net income (loss) available to common shareholders		$ 4,207	$ 4,989	$ 15,908	$ 18,993

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