Commitments and Contingencies Level 4 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 27,400	$ 30,500	$ 31,900
Operating Leases, Future Minimum Payments Due, Current	11,295
Operating Leases, Future Minimum Payments, Due in Two Years	9,550
Operating Leases, Future Minimum Payments, Due in Three Years	8,251
Operating Leases, Future Minimum Payments, Due in Four Years	7,282
Operating Leases, Future Minimum Payments, Due in Five Years	5,397
Operating Leases, Future Minimum Payments, Due Thereafter	37,841
Operating Leases, Future Minimum Payments Due	79,616
Capital Leases, Future Minimum Payments Due, Current	46,998
Capital Leases, Future Minimum Payments Due in Two Years	51,943
Capital Leases, Future Minimum Payments Due in Three Years	57,881
Capital Leases, Future Minimum Payments Due in Four Years	21,842
Capital Leases, Future Minimum Payments Due in Five Years	15,587
Capital Leases, Future Minimum Payments Due Thereafter	40,447
Capital Leases, Future Minimum Payments Due	234,698
Capital Leases, Future Minimum Payments, Interest Included in Payments	(22,746)
Capital Leases, Future Minimum Payments, Net Minimum Payments	211,952
Agreements, Future Payments, Due in One Year	8,126
Agreements, Future Payments, Due in Two Years	5,998
Agreements, Future Payments, Due in Three Years	4,362
Agreements, Future Payments, Due in Four Years	3,322
Agreements, Future Payments, Due in Five Years	2,046
Agreements, Future Payments, Due in Six Years and Thereafter	6,135
Agreements, Future Payments Due	29,989
Self Insurance Reserve	80,100	$ 78,200
Payments for Legal Settlements	2,500
Loss Contingency, Damages Sought, Value	13,600
Employment Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	1,823
Agreements, Future Payments, Due in Two Years	1,116
Agreements, Future Payments, Due in Three Years	674
Agreements, Future Payments, Due in Four Years	332
Agreements, Future Payments, Due in Five Years	94
Agreements, Future Payments, Due in Six Years and Thereafter	0
Agreements, Future Payments Due	4,039
Consulting Agreement [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	632
Agreements, Future Payments, Due in Two Years	517
Agreements, Future Payments, Due in Three Years	387
Agreements, Future Payments, Due in Four Years	307
Agreements, Future Payments, Due in Five Years	78
Agreements, Future Payments, Due in Six Years and Thereafter	214
Agreements, Future Payments Due	2,135
Noncompete Agreements [Member]
Loss Contingencies [Line Items]
Agreements, Future Payments, Due in One Year	5,671
Agreements, Future Payments, Due in Two Years	4,365
Agreements, Future Payments, Due in Three Years	3,301
Agreements, Future Payments, Due in Four Years	2,683
Agreements, Future Payments, Due in Five Years	1,874
Agreements, Future Payments, Due in Six Years and Thereafter	5,921
Agreements, Future Payments Due	$ 23,815
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