Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Current	$ 29,885	$ 32,295	$ 31,610
Deferred	6,085	9,575	11,563
Total income tax expense	$ 35,970	$ 41,870	$ 43,173