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Basis of Presentation and Consolidation (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease to retained earnings | $ (635,438) |  | $ (633,496) | $ (570,406)
Rail Group | Revenues under ASC 606 | Assets, Net |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase in net assets |  | $ 25,600 |  |
Rail Group | Revenues under ASC 606 | Financing Obligations |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase in financing liabilities and deferred tax liabilities |  | 34,000 |  |
ASC 606 Impact | Revenues under ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease to retained earnings | $ (8,475) |  |  |
ASC 606 Impact | Rail Group | Revenues under ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease to retained earnings |  | $ 8,400 |  |

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