Property and Equipment and Leases (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Capital Leased Assets [Line Items]
Capital Leases, Future Minimum Payments Due, Current	$ 1,313
Operating Leases, Future Minimum Payments Due, Current	43,482
Total Capital and Operating Leases, Future Minimum Payments Due, Current	44,795
Capital Leases, Future Minimum Payments Due in Two Years	1,313
Operating Leases, Future Minimum Payments, Due in Two Years	27,787
Total Capital and Operating Leases, Future Minimum Payments, Due in Two Years	29,100
Capital Leases, Future Minimum Payments Due in Three Years	1,314
Operating Leases, Future Minimum Payments, Due in Three Years	20,877
Total Capital and Operating Leases, Future Minimum Payments, Due in Three Years	22,191
Capital Leases, Future Minimum Payments Due in Four Years	1,315
Operating Leases, Future Minimum Payments, Due in Four Years	18,019
Total Capital and Operating Leases, Future Minimum Payments, Due in Four Years	19,334
Capital Leases, Future Minimum Payments Due in Five Years	5,029
Operating Leases, Future Minimum Payments, Due in Five Years	14,577
Total Capital and Operating Leases, Future Minimum Payments, Due in Five Years	19,606
Capital Leases, Future Minimum Payments Due Thereafter	225
Operating Leases, Future Minimum Payments, Due Thereafter	172,878
Total Capital and Operating Leases, Future Minimum Payments, Due Thereafter	173,103
Capital Leases, Future Minimum Payments Due	10,509
Operating Leases, Future Minimum Payments Due	297,620
Total Capital and Operating Leases, Future Minimum Payments	$ 308,129