Commitments and Contingencies Level 4 (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 28,400,000	$ 26,800,000	$ 25,700,000
Operating Leases, Future Minimum Payments Due, Current	15,098,000
Operating Leases, Future Minimum Payments, Due in Two Years	13,051,000
Operating Leases, Future Minimum Payments, Due in Three Years	11,363,000
Operating Leases, Future Minimum Payments, Due in Four Years	9,343,000
Operating Leases, Future Minimum Payments, Due in Five Years	8,148,000
Operating Leases, Future Minimum Payments, Due Thereafter	65,281,000
Operating Leases, Future Minimum Payments Due	122,284,000
Capital Leases, Future Minimum Payments Due, Current	38,652,000
Capital Leases, Future Minimum Payments Due in Two Years	50,627,000
Capital Leases, Future Minimum Payments Due in Three Years	18,178,000
Capital Leases, Future Minimum Payments Due in Four Years	36,932,000
Capital Leases, Future Minimum Payments Due in Five Years	32,418,000
Capital Leases, Future Minimum Payments Due Thereafter	12,890,000
Capital Leases, Future Minimum Payments Due	189,697,000
Capital Leases, Future Minimum Payments, Interest Included in Payments	(19,892,000)
Capital Leases, Future Minimum Payments, Net Minimum Payments	169,805,000
Agreements, Future Payments, Due in One Year	8,970,000
Agreements, Future Payments, Due in Two Years	6,203,000
Agreements, Future Payments, Due in Three Years	4,756,000
Agreements, Future Payments, Due in Four Years	4,270,000
Agreements, Future Payments, Due in Five Years	3,728,000
Agreements, Future Payments, Due in Six Years and Thereafter	7,719,000
Agreements, Future Payments Due	35,646,000
Self Insurance Reserve	78,000,000	57,500,000
Self insurance reserve, business acquired	21,500,000
Employment Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	3,034,000
Agreements, Future Payments, Due in Two Years	1,645,000
Agreements, Future Payments, Due in Three Years	831,000
Agreements, Future Payments, Due in Four Years	698,000
Agreements, Future Payments, Due in Five Years	324,000
Agreements, Future Payments, Due in Six Years and Thereafter	141,000
Agreements, Future Payments Due	6,673,000
Consulting Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	756,000
Agreements, Future Payments, Due in Two Years	458,000
Agreements, Future Payments, Due in Three Years	181,000
Agreements, Future Payments, Due in Four Years	69,000
Agreements, Future Payments, Due in Five Years	69,000
Agreements, Future Payments, Due in Six Years and Thereafter	125,000
Agreements, Future Payments Due	1,658,000
Noncompete Agreements [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	5,180,000
Agreements, Future Payments, Due in Two Years	4,100,000
Agreements, Future Payments, Due in Three Years	3,744,000
Agreements, Future Payments, Due in Four Years	3,503,000
Agreements, Future Payments, Due in Five Years	3,335,000
Agreements, Future Payments, Due in Six Years and Thereafter	7,453,000
Agreements, Future Payments Due	$ 27,315,000
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