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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Commitments and Contingencies Disclosure [Abstract]        
Balance, beginning of period $ 717,024 $ 736,130 $ 721,284 $ 739,029
Reserves provided 16,357 10,920 30,827 22,215
Payments (25,239) (14,008) (43,969) (28,202)
Balance, end of period $ 708,142 $ 733,042 $ 708,142 $ 733,042