Nature of Business and Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash paid for:
Interest	$ 13,039	$ 13,410	$ 12,922
Taxes	$ 68,534	$ 47,434	$ 88,277