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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]    
Balance, beginning of period $ 668,100 $ 721,284
Reserves provided 14,855 14,470
Payments (18,544) (18,730)
Balance, end of period $ 664,411 $ 717,024