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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 707,306 $ 700,133 $ 692,053 $ 710,245
Reserves provided, net 20,234 14,021 65,302 20,467
Payments (24,993) (11,670) (54,808) (28,228)
Balance, end of period $ 702,547 $ 702,484 $ 702,547 $ 702,484