Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingency [Abstract]
Supplemental Unemployment Benefits, Severance Benefits	$ 7,800,000
Operating Leases, Rent Expense	23,200,000	21,600,000	20,900,000
Operating Leases, Future Minimum Payments Due [Abstract]
Operating Leases, Future Minimum Payments Due, Current	14,956,000
Operating Leases, Future Minimum Payments, Due in Two Years	10,096,000
Operating Leases, Future Minimum Payments, Due in Three Years	7,069,000
Operating Leases, Future Minimum Payments, Due in Four Years	5,059,000
Operating Leases, Future Minimum Payments, Due in Five Years	3,508,000
Operating Leases, Future Minimum Payments, Due Thereafter	9,973,000
Operating Leases, Future Minimum Payments Due	$ 50,661,000