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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Insurance And Claims Accruals [Member] |  |  |  |
Insurance and claims accruals: |  |  |  |
Balance at beginning of year |  | $ 13,998 | $ 14,404 | $ 13,838
Charged to costs and expenses |  | 45,271 | 41,036 | 35,194
Deductions | [1] | (43,034) | (41,442) | (34,628)
Balance at end of year |  | 16,235 | 13,998 | 14,404
Allowance for Doubtful Accounts [Member] |  |  |  |
Insurance and claims accruals: |  |  |  |
Balance at beginning of year |  | 475 | 450 | 334
Charged to costs and expenses |  | 59 | 264 | 225
Deductions | [2] | (229) | (239) | (109)
Balance at end of year |  | $ 305 | $ 475 | $ 450
[1] | Claims payments
[2] | Write-off of bad debts, net of recoveries

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