Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income per Share [Abstract]
Net income	[1]	$ 6,853	$ 3,068	$ 14,444	$ 6,594
Less: earnings allocated to RSUs		(208)	(125)	(443)	(263)
Net income (loss) available to common shareholders		$ 6,645	$ 2,943	$ 14,001	$ 6,331

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