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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]        
Balance, beginning of period $ 708,142 $ 733,042 $ 721,284 $ 739,029
Reserves provided 21,439 15,557 52,266 37,772
Payments (37,983) (24,773) (81,952) (52,975)
Balance, end of period $ 691,598 $ 723,826 $ 691,598 $ 723,826