Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 49,300	$ 46,000	$ 49,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	42,727
Operating Leases, Future Minimum Payments, Due in Two Years	39,505
Operating Leases, Future Minimum Payments, Due in Three Years	34,277
Operating Leases, Future Minimum Payments, Due in Four Years	29,393
Operating Leases, Future Minimum Payments, Due in Five Years	22,222
Operating Leases, Future Minimum Payments, Due Thereafter	45,036
Operating Leases, Future Minimum Payments Due	$ 213,160