Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Loss Contingency [Abstract]
Supplemental Unemployment Benefits, Severance Benefits	$ 8,400
Operating Leases, Rent Expense	22,200	$ 24,100	$ 23,200
Operating Leases, Future Minimum Payments Due [Abstract]
Operating Leases, Future Minimum Payments Due, Current	15,565
Operating Leases, Future Minimum Payments, Due in Two Years	12,208
Operating Leases, Future Minimum Payments, Due in Three Years	9,390
Operating Leases, Future Minimum Payments, Due in Four Years	6,507
Operating Leases, Future Minimum Payments, Due in Five Years	4,656
Operating Leases, Future Minimum Payments, Due Thereafter	18,659
Operating Leases, Future Minimum Payments Due	66,985
Proposed tax deficiency	$ 11,000