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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Significant Accounting Policies [Abstract] |
Property, Plant and Equipment [Table Text Block] |
Lives of the assets are as follows: |
| Years
Land improvements and buildings | 5-30
Leasehold improvements | 5-25
Furniture and fixtures | 3-5
Shop and service equipment | 3-10
Revenue equipment | 5-7
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | A reconciliation of the numerator (net income) and denominator (weighted average number of shares outstanding) of the basic and diluted earnings per share (“EPS”) for 2018, 2017, and 2016 is as follows (in thousands, except per share data):
| 2018 |  |  |  |
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 72,677 |  | 82,378 |  | $ | 0.88
Effect of restricted stock | — |  | 32 |  |
Diluted EPS | $ | 72,677 |  | 82,410 |  | $ | 0.88
| 2017 |  |  |  |
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 75,173 |  | 83,298 |  | $ | 0.90
Effect of restricted stock | — |  | 38 |  |
Diluted EPS | $ | 75,173 |  | 83,336 |  | $ | 0.90
| 2016 |  |  |  |
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 56,386 |  | 83,297 |  | $ | 0.68
Effect of restricted stock | — |  | 68 |  |
Diluted EPS | $ | 56,386 |  | 83,365 |  | $ | 0.68

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- Definition Significant Accounting Policies [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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