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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 692,980 $ 720,767 $ 692,053 $ 710,245
Reserves provided, net 25,317 (9,386) 45,068 6,446
Payments (10,991) (11,248) (29,815) (16,558)
Balance, end of period $ 707,306 $ 700,133 $ 707,306 $ 700,133