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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2015
Fair Value Measurements [Abstract] |  |  |  |  |
Purchase price in escrow |  |  |  |  | $ 1,960
Escrow receivable |  |  | $ 1,470 | $ 1,960 |
cash received from escrow |  |  | 490 |  |
Asset impairment charge | $ 333 | $ 1,255 | $ 333 | $ 1,255 |

X
- Definition Fair value of escrow receivable from sale of railcar repair and maintenance services business. + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of aggregate purchase prices related to the disposal of an asset or business unit in order to secure indemnification obligations. + References No definition available. + Details
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Namespace Prefix: | rail_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of cash outflow associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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