Leases (Future Min Schedule) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Leases
Capital Leases, Future Minimum Payments Due, Current	$ 3,448
Capital Leases, Future Minimum Payments Due in Two Years	1,762
Capital Leases, Future Minimum Payments Due in Three Years	1,171
Capital Leases, Future Minimum Payments Due in Four Years	986
Capital Leases, Future Minimum Payments Due in Five Years	924
Capital Leases, Future Minimum Payments Due Thereafter	8,847
Total minimum rentals	17,138
Less amounts representing interest	4,427
Capital Lease Obligations	12,711	13,930
Operating Leases, Future Minimum Payments Due, Current	42,483
Operating Leases, Future Minimum Payments, Due in Two Years	41,861
Operating Leases, Future Minimum Payments, Due in Three Years	41,385
Operating Leases, Future Minimum Payments, Due in Four Years	40,434
Operating Leases, Future Minimum Payments, Due in Five Years	39,744
Operating Leases, Future Minimum Payments, Due Thereafter	314,692
Total minimum rentals	$ 520,599