Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Current	$ 26,359	$ 29,885	$ 32,295
Deferred	4,108	6,085	9,575
Total income tax expense	$ 30,467	$ 35,970	$ 41,870