Commitments and Contingencies Level 4 (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 26,800,000	$ 25,700,000	$ 24,700,000
Operating Leases, Future Minimum Payments Due, Current	12,147,000
Operating Leases, Future Minimum Payments, Due in Two Years	10,187,000
Operating Leases, Future Minimum Payments, Due in Three Years	8,348,000
Operating Leases, Future Minimum Payments, Due in Four Years	7,213,000
Operating Leases, Future Minimum Payments, Due in Five Years	6,322,000
Operating Leases, Future Minimum Payments, Due Thereafter	45,295,000
Operating Leases, Future Minimum Payments Due	89,512,000
Capital Leases, Future Minimum Payments Due, Current	27,420,000
Capital Leases, Future Minimum Payments Due in Two Years	33,121,000
Capital Leases, Future Minimum Payments Due in Three Years	46,790,000
Capital Leases, Future Minimum Payments Due in Four Years	14,389,000
Capital Leases, Future Minimum Payments Due in Five Years	33,285,000
Capital Leases, Future Minimum Payments Due Thereafter	33,901,000
Capital Leases, Future Minimum Payments Due	188,906,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	(12,461,000)
Capital Leases, Future Minimum Payments, Net Minimum Payments	176,445,000
Agreements, Future Payments, Due in One Year	8,365,000
Agreements, Future Payments, Due in Two Years	7,194,000
Agreements, Future Payments, Due in Three Years	5,344,000
Agreements, Future Payments, Due in Four Years	4,102,000
Agreements, Future Payments, Due in Five Years	3,716,000
Agreements, Future Payments, Due in Six Years and Thereafter	10,693,000
Agreements, Future Payments Due	39,414,000
Self Insurance Reserve	57,500,000	52,700,000
Employment Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	2,990,000
Agreements, Future Payments, Due in Two Years	2,441,000
Agreements, Future Payments, Due in Three Years	1,282,000
Agreements, Future Payments, Due in Four Years	541,000
Agreements, Future Payments, Due in Five Years	448,000
Agreements, Future Payments, Due in Six Years and Thereafter	267,000
Agreements, Future Payments Due	7,969,000
Consulting Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	716,000
Agreements, Future Payments, Due in Two Years	581,000
Agreements, Future Payments, Due in Three Years	390,000
Agreements, Future Payments, Due in Four Years	173,000
Agreements, Future Payments, Due in Five Years	69,000
Agreements, Future Payments, Due in Six Years and Thereafter	193,000
Agreements, Future Payments Due	2,122,000
Noncompete Agreements [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	4,659,000
Agreements, Future Payments, Due in Two Years	4,172,000
Agreements, Future Payments, Due in Three Years	3,672,000
Agreements, Future Payments, Due in Four Years	3,388,000
Agreements, Future Payments, Due in Five Years	3,199,000
Agreements, Future Payments, Due in Six Years and Thereafter	10,233,000
Agreements, Future Payments Due	$ 29,323,000
Minimum [Member]
Loss Contingencies [Line Items]
Management, consulting and non-compete agreement term	5 years
Maximum [Member]
Loss Contingencies [Line Items]
Management, consulting and non-compete agreement term	10 years