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Schedule II-Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance For Doubtful Accounts [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 6,728 $ 5,647 $ 4,761
“Additions” Charged to Costs and Expenses 9,421 9,726 9,217
“Other” Additions (Deductions) 0 0 0
“Less” Deductions 6,901 8,645 8,331
Balance at End of Year 9,248 6,728 5,647
Insurance Reserves [Member]
      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 25,188 30,548 28,067
“Additions” Charged to Costs and Expenses 52,658 [1] 43,024 [1] 46,287 [1]
“Other” Additions (Deductions) 0 0 0
“Less” Deductions 46,966 [2] 48,384 [2] 43,806 [2]
Balance at End of Year $ 30,880 $ 25,188 $ 30,548
[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.