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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Commitments and Contingencies Disclosure [Abstract]        
Balance, beginning of period $ 733,042 $ 759,714 $ 739,029 $ 787,918
Reserves provided 15,557 14,790 37,772 42,000
Payments (24,773) (18,104) (52,975) (73,518)
Balance, end of period $ 723,826 $ 756,400 $ 723,826 $ 756,400