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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - Valuation and Qualifying Accounts and Reserves (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Insurance and Claims Accruals [Member]
      
Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - Valuation and Qualifying Accounts and Reserves [Line Items]      
Balance at Beginning of Year $ 13,838 $ 13,042 $ 17,653
Charged to Costs and Expenses 35,194 32,548 27,675
Deductions (34,628) [1] (31,752) [1] (32,286) [1]
Balance at End of Year 14,404 13,838 13,042
Allowance for Doubtful Accounts [Member]
      
Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - Valuation and Qualifying Accounts and Reserves [Line Items]      
Balance at Beginning of Year 334 470 170
Charged to Costs and Expenses 225   544
Deductions (109) [2] (136) [2] (244) [2]
Balance at End of Year $ 450 $ 334 $ 470
[1] Claims payments
[2] Write-off of bad debts, net of recoveries