Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) individual	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Loss Contingency [Abstract]
Loss Contingency Accrual		$ 8,600
Deferred Compensation Arrangement with Individual, Number of Individuals with Benefits | individual	3
Supplemental Unemployment Benefits, Severance Benefits	$ 8,000
Operating Leases, Rent Expense	20,300	$ 22,200	$ 24,100
Operating Leases, Future Minimum Payments Due [Abstract]
Operating Leases, Future Minimum Payments Due, Current	15,514
Operating Leases, Future Minimum Payments, Due in Two Years	11,557
Operating Leases, Future Minimum Payments, Due in Three Years	8,563
Operating Leases, Future Minimum Payments, Due in Four Years	6,330
Operating Leases, Future Minimum Payments, Due in Five Years	4,575
Operating Leases, Future Minimum Payments, Due Thereafter	15,522
Operating Leases, Future Minimum Payments Due	$ 62,061