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Related Party (Tables) | 12 Months Ended
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Dec. 31, 2016
Related Party [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | The related payments (receipts) with related parties for the years ended December 31, 2016, 2015, and 2014 were as follows:
| December 31, 2016 |  | December 31, 2015 |  | December 31, 2014
| (in thousands)
Payments for tractor purchases | $ | 4,300 |  |  | $ | 58,599 |  |  | $ | 46,562 |
Receipts for tractor sales | — |  |  | (38,064 | ) |  | (15,564 | )
Receipts for trailer sales | (108 | ) |  | (28 | ) |  | (103 | )
Revenue equipment lease payments | 813 |  |  | 3,223 |  |  | 6,842 |
Payments for parts and services | 1,300 |  |  | 4,346 |  |  | 5,906 |
Terminal lease payments | 1,849 |  |  | 3,408 |  |  | 3,930 |
Terminal purchase option payments | — |  |  | 21,555 |  |  | 2,825 |
Administrative services receipts | — |  |  | — |  |  | (516 | )
| $ | 8,154 |  |  | $ | 53,039 |  |  | $ | 49,882 |

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- Definition Related Party [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration