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Commitments And Contingencies (Changes in Self-insurance Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Balance, beginning of period $ 741,383 $ 785,562
Reserves provided 12,978 14,924
Payments (14,337) (25,734)
Balance, end of period $ 740,024 $ 774,752