Net Income per Share (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Net Income per Share [Abstract]
Net income	[1]	$ 7,414	$ 6,162
Less earnings allocated to RSUs		(179)	(125)
Net income available to common shareholders		$ 7,235	$ 6,037

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