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Acquisition of Gordon Trucking, Inc. Assets acquired and liabilities assumed (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Nov. 11, 2013 USD ($) | Dec. 31, 2012 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Assets of business combination as percentage total assets | 0.486 |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |
Cash and cash equivalents | $ 17,303 | $ 17,763 | $ 33,232 |  | $ 119,838
Other current assets | 8,992 |  | 8,316 |  |
Property, Plant and Equipment, Gross | 678,566 |  | 671,946 |  |
Other Assets, Noncurrent | 12,611 |  | 11,363 |  |
Finite-Lived Intangible Assets, Gross | 19,042 |  | 19,042 |  |
Goodwill | 100,212 | 98,686 | 100,212 |  |
Assets | 759,994 |  | 736,030 |  |
Other long-term liabilities | $ (11,318) |  | $ (12,153) |  |
Revenues of business combination as percentage of total revenues | 0.096 |  |  |  |
Gordon Trucking Company, Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 21,485 |
Accounts Receivable, Net |  |  |  | 45,679 |
Other current assets |  |  |  | 14,371 |
Property, Plant and Equipment, Gross |  |  |  | 189,409 |
Other Assets, Noncurrent |  |  |  | 3,916 |
Finite-Lived Intangible Assets, Gross |  |  |  | 19,042 |
Goodwill |  |  |  | 95,371 |
Assets |  |  |  | 389,273 |
Accounts Payable and Accrued Liabilities |  |  |  | (30,665) |
Self Insurance Reserve |  |  |  | (23,821) |
Long-term Debt |  |  |  | (147,942) |
Business Combination, Contingent Consideration, Liability |  |  |  | (13,618) |
Other long-term liabilities |  |  |  | $ (1,227) |
Total consideration transferred to acquire a business |  | $ 172,000 |  |  |

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