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Schedule II-Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance For Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 4,761 $ 4,086 $ 2,660
"Additions" charged to costs and expenses 9,217 8,658 9,409
"Other" additions (deductions) 0 0 0
"Less" deductions 8,331 7,983 7,983
Balance at end of year 5,647 4,761 4,086
Insurance Reserves [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 28,067 23,722 18,967
"Additions" charged to costs and expenses 46,287 [1] 47,848 [1] 48,203 [1]
"Other" additions (deductions) 0 0 0
"Less" deductions 43,806 [2] 43,503 [2] 43,448 [2]
Balance at end of year $ 30,548 $ 28,067 $ 23,722
[1] Includes costs and expenses incurred for premiums and claims related to health and general insurance.
[2] Includes costs and expenses paid for premiums and claims related to health and general insurance.