Commitments and Contingencies Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 31,900	$ 33,300	$ 37,200
Operating Leases, Future Minimum Payments Due, Current	14,201
Operating Leases, Future Minimum Payments, Due in Two Years	12,122
Operating Leases, Future Minimum Payments, Due in Three Years	10,028
Operating Leases, Future Minimum Payments, Due in Four Years	8,542
Operating Leases, Future Minimum Payments, Due in Five Years	7,564
Operating Leases, Future Minimum Payments, Due Thereafter	67,655
Operating Leases, Future Minimum Payments Due	120,112
Capital Leases, Future Minimum Payments Due, Current	59,598
Capital Leases, Future Minimum Payments Due in Two Years	52,353
Capital Leases, Future Minimum Payments Due in Three Years	21,533
Capital Leases, Future Minimum Payments Due in Four Years	29,528
Capital Leases, Future Minimum Payments Due in Five Years	24,829
Capital Leases, Future Minimum Payments Due Thereafter	20,917
Capital Leases, Future Minimum Payments Due	208,758
Capital Leases, Future Minimum Payments, Interest Included in Payments	(16,417)
Capital Leases, Future Minimum Payments, Net Minimum Payments	192,341
Agreements, Future Payments, Due in One Year	6,518
Agreements, Future Payments, Due in Two Years	5,609
Agreements, Future Payments, Due in Three Years	5,136
Agreements, Future Payments, Due in Four Years	3,437
Agreements, Future Payments, Due in Five Years	2,129
Agreements, Future Payments, Due in Six Years and Thereafter	4,315
Agreements, Future Payments Due	27,144
Self Insurance Reserve	78,000	$ 76,600
Employment Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	1,692
Agreements, Future Payments, Due in Two Years	1,035
Agreements, Future Payments, Due in Three Years	818
Agreements, Future Payments, Due in Four Years	375
Agreements, Future Payments, Due in Five Years	107
Agreements, Future Payments, Due in Six Years and Thereafter	0
Agreements, Future Payments Due	4,027
Consulting Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	185
Agreements, Future Payments, Due in Two Years	138
Agreements, Future Payments, Due in Three Years	115
Agreements, Future Payments, Due in Four Years	45
Agreements, Future Payments, Due in Five Years	0
Agreements, Future Payments, Due in Six Years and Thereafter	0
Agreements, Future Payments Due	483
Noncompete Agreements [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	4,641
Agreements, Future Payments, Due in Two Years	4,436
Agreements, Future Payments, Due in Three Years	4,203
Agreements, Future Payments, Due in Four Years	3,017
Agreements, Future Payments, Due in Five Years	2,022
Agreements, Future Payments, Due in Six Years and Thereafter	4,315
Agreements, Future Payments Due	$ 22,634
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