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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (Railcar Segment [Member], USD $) | 0 Months Ended | 1 Months Ended | 6 Months Ended |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2013 | Sep. 30, 2012 | Jun. 30, 2013 | Feb. 28, 2007 Senior unsecured notes [Member] | Jun. 30, 2013 Term Loan [Member] | Dec. 31, 2012 Term Loan [Member] | Dec. 01, 2012 Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  | $ 275,000,000 |  |  |
Draw on term loan, initial draw |  |  |  |  |  |  | 98,000,000
Long-term Debt |  |  |  |  | 198,000,000 | 100,000,000 |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.50% |  |
Pledged assets |  |  |  |  | 224,000,000 | 112,000,000 |
Repayments of debt | 175,000,000 | 100,000,000 |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | 1,000,000 |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  |  |  | $ 100,000,000 |  |

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