Lease Comitments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Current	$ 61,749
Operating Leases, Future Minimum Payments, Due in Two Years	50,182
Operating Leases, Future Minimum Payments, Due in Three Years	32,312
Operating Leases, Future Minimum Payments, Due in Four Years	23,222
Operating Leases, Future Minimum Payments, Due in Five Years	15,468
Operating Leases, Future Minimum Payments, Due Thereafter	$ 26,555