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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 771,104 $ 835,326 $ 758,812 $ 831,058
Reserves provided, net 23,235 23,411 42,895 43,126
Adjustments to previously recorded reserves (a) (37,529) (19,813) (35,068) (21,793)
Payments, net (b) (31,328) (24,168) (41,157) (37,635)
Balance, end of period $ 725,482 $ 814,756 725,482 814,756
Adjustment to self insurance reserves     $ 37,900 $ 19,800