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Commitments And Contingencies (Changes in Self-insurance Liability) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]      
Balance, beginning of period $ 739,029 $ 787,918 $ 551,020
Reserves provided 54,262 48,359 313,606
Liabilities assumed with merger 0 0 2,514
Payments (72,007) (97,248) (79,222)
Balance, end of period $ 721,284 $ 739,029 $ 787,918