Leases (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Leases [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 23,290
Operating Leases, Future Minimum Payments, Due in Two Years	22,250
Operating Leases, Future Minimum Payments, Due in Three Years	20,160
Operating Leases, Future Minimum Payments, Due in Four Years	17,600
Operating Leases, Future Minimum Payments, Due in Five Years	16,480
Operating Leases, Future Minimum Payments, Due Thereafter	54,830
Operating Leases, Future Minimum Payments Due	$ 154,610