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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 835,326 $ 922,385 $ 831,058 $ 924,563
Reserves provided, net 18,894 25,317 38,609 45,516
Adjustments to previously recorded reserves (a) (19,813) 0 (21,793) (448)
Payments, net (b) (19,651) (10,991) (33,118) (32,920)
Balance, end of period 814,756 $ 936,711 814,756 $ 936,711
Gain (loss) related to litigation settlement $ 19,800   $ 19,800