Property and Equipment and Leases (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Capital Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Current	$ 19,900
Total Capital and Operating Leases, Future Minimum Payments Due, Current	19,922
Operating Leases, Future Minimum Payments, Due in Two Years	15,850
Total Capital and Operating Leases, Future Minimum Payments, Due in Two Years	15,873
Operating Leases, Future Minimum Payments, Due in Three Years	12,013
Total Capital and Operating Leases, Future Minimum Payments, Due in Three Years	12,037
Operating Leases, Future Minimum Payments, Due in Four Years	8,922
Total Capital and Operating Leases, Future Minimum Payments, Due in Four Years	8,946
Operating Leases, Future Minimum Payments, Due in Five Years	8,049
Total Capital and Operating Leases, Future Minimum Payments, Due in Five Years	8,075
Operating Leases, Future Minimum Payments, Due Thereafter	103,910
Total Capital and Operating Leases, Future Minimum Payments, Due Thereafter	104,154
Operating Leases, Future Minimum Payments Due	168,644
Total Capital and Operating Leases, Future Minimum Payments	169,007
Capital Lease Obligations [Member]
Capital Leased Assets [Line Items]
Capital Leases, Future Minimum Payments Due, Current	22
Capital Leases, Future Minimum Payments Due in Two Years	23
Capital Leases, Future Minimum Payments Due in Three Years	24
Capital Leases, Future Minimum Payments Due in Four Years	24
Capital Leases, Future Minimum Payments Due in Five Years	26
Capital Leases, Future Minimum Payments Due Thereafter	244
Capital Leases, Future Minimum Payments Due	$ 363