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Segment Information (Textual) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments (business segments) | segment |  |  |  |  |  |  |  |  | 4 |  |
Number of consolidated segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Number of segments accounted for as equity method investments | segment |  |  |  |  |  |  |  |  | 3 |  |
Sales and merchandising revenues | $ 812,662 | $ 685,579 | $ 911,402 | $ 635,739 | $ 1,004,072 | $ 836,595 | $ 993,662 | $ 852,016 | $ 3,045,382 | $ 3,686,345 | $ 3,924,790
Rail Group assets leased to others, net | 521,785 |  |  |  | 423,443 |  |  |  | 521,785 | 423,443 |
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | 0 | 47,871 | 134,229
Canada | Grain |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | 202,700 | 166,200 | 78,300
Canada | Rail |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales and merchandising revenues |  |  |  |  |  |  |  |  | 10,700 | 13,300 | $ 13,200
Canada | Railcar | Rail |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rail Group assets leased to others, net | $ 23,200 |  |  |  | $ 21,200 |  |  |  | $ 23,200 | $ 21,200 |
Customer Concentration Risk | Revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 10.00% |  |

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