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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 725,482 $ 814,756 $ 758,812 $ 831,058
Reserves provided, net 24,106 24,361 67,001 62,970
Adjustments to previously recorded reserves (a) (5,065) (511) (40,133) (22,304)
Payments, net (b) (18,026) (13,981) (59,183) (47,099)
Balance, end of period $ 726,497 $ 824,625 726,497 824,625
Adjustment to self insurance reserves     $ 37,900 $ 19,800