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Schedule II - Valuation and Qualifying Accounts and Reserves (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Valuation And Qualifying Accounts And Reserves [Table Text Block] |
Description |  | Balance at Beginning of Year |  |  | Charged to Costs and Expenses |  |  | Deductions |  |  | Balance at End of Year |
Insurance and claims accruals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2015 |  | $ | 13,998 |  |  | $ | 45,271 |  |  | $ | (43,034 | ) (1) |  | $ | 16,235 |
Year ended December 31, 2014 |  |  | 14,404 |  |  |  | 41,036 |  |  |  | (41,442 | ) (1) |  |  | 13,998 |
Year ended December 31, 2013 |  |  | 13,838 |  |  |  | 35,194 |  |  |  | (34,628 | ) (1) |  |  | 14,404 |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2015 |  |  | 475 |  |  |  | 59 |  |  |  | (229 | ) (2) |  |  | 305 |
Year ended December 31, 2014 |  |  | 450 |  |  |  | 264 |  |  |  | (239 | ) (2) |  |  | 475 |
Year ended December 31, 2013 |  |  | 334 |  |  |  | 225 |  |  |  | (109 | ) (2) |  |  | 450 |

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