Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net Income per Share [Abstract]
Net income	[1]	$ 5,853	$ 6,853	$ 12,015	$ 14,444
Less earnings allocated to RSUs		(157)	(208)	(315)	(443)
Net income (loss) available to common shareholders		$ 5,696	$ 6,645	$ 11,700	$ 14,001

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