Commitments and Contingencies Level 4 (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 25,700,000	$ 24,700,000	$ 22,800,000
Operating Leases, Future Minimum Payments Due, Current	13,215,000
Operating Leases, Future Minimum Payments, Due in Two Years	11,210,000
Operating Leases, Future Minimum Payments, Due in Three Years	9,248,000
Operating Leases, Future Minimum Payments, Due in Four Years	7,328,000
Operating Leases, Future Minimum Payments, Due in Five Years	5,760,000
Operating Leases, Future Minimum Payments, Due Thereafter	41,192,000
Operating Leases, Future Minimum Payments Due	87,953,000
Capital Leases, Future Minimum Payments Due, Current	24,930,000
Capital Leases, Future Minimum Payments Due in Two Years	21,420,000
Capital Leases, Future Minimum Payments Due in Three Years	27,168,000
Capital Leases, Future Minimum Payments Due in Four Years	39,439,000
Capital Leases, Future Minimum Payments Due in Five Years	7,474,000
Capital Leases, Future Minimum Payments Due Thereafter	18,531,000
Capital Leases, Future Minimum Payments Due	138,962,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	(14,632,000)
Capital Leases, Future Minimum Payments, Net Minimum Payments	124,330,000
Agreements, Future Payments, Due in One Year	8,529,000
Agreements, Future Payments, Due in Two Years	5,979,000
Agreements, Future Payments, Due in Three Years	4,791,000
Agreements, Future Payments, Due in Four Years	3,169,000
Agreements, Future Payments, Due in Five Years	2,500,000
Agreements, Future Payments, Due in Six Years and Thereafter	7,830,000
Agreements, Future Payments Due	32,798,000
Self Insurance Reserve	52,700,000	53,900,000
Loss Contingency, Range of Possible Loss, Minimum	950,000,000
Loss Contingency, Range of Possible Loss, Maximum	1,500,000,000
Employment Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	3,603,000
Agreements, Future Payments, Due in Two Years	2,079,000
Agreements, Future Payments, Due in Three Years	1,473,000
Agreements, Future Payments, Due in Four Years	491,000
Agreements, Future Payments, Due in Five Years	205,000
Agreements, Future Payments, Due in Six Years and Thereafter	432,000
Agreements, Future Payments Due	8,283,000
Consulting Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	852,000
Agreements, Future Payments, Due in Two Years	438,000
Agreements, Future Payments, Due in Three Years	330,000
Agreements, Future Payments, Due in Four Years	201,000
Agreements, Future Payments, Due in Five Years	99,000
Agreements, Future Payments, Due in Six Years and Thereafter	262,000
Agreements, Future Payments Due	2,182,000
Noncompete Agreements [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	4,074,000
Agreements, Future Payments, Due in Two Years	3,462,000
Agreements, Future Payments, Due in Three Years	2,988,000
Agreements, Future Payments, Due in Four Years	2,477,000
Agreements, Future Payments, Due in Five Years	2,196,000
Agreements, Future Payments, Due in Six Years and Thereafter	7,136,000
Agreements, Future Payments Due	$ 22,333,000