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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (Railcar Segment [Member], USD $) | 1 Months Ended |  |  | 1 Months Ended |  |  |  |  | 0 Months Ended
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Sep. 30, 2012 | Dec. 31, 2012 Senior unsecured notes [Member] | Feb. 28, 2007 Senior unsecured notes [Member] | Feb. 28, 2013 Term Loan [Member] | Mar. 31, 2013 Term Loan [Member] | Feb. 01, 2013 Term Loan [Member] | Dec. 31, 2012 Term Loan [Member] | Dec. 01, 2012 Term Loan [Member] | Mar. 01, 2013 Repayment of Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  | $ 275,000,000 |  |  |  |  | $ 200,000,000 |
Draw on term loan, initial draw |  |  |  |  |  |  |  | 98,000,000 |
Long-term Debt |  |  |  |  | 150,000,000 |  | 100,000,000 |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.50% |  |  |  |
Pledged assets |  |  |  |  | 170,000,000 |  | 112,000,000 |  |
Repayments of debt | 100,000,000 |  |  |  |  |  |  |  | 175,000,000
Interest rate, long-term debt |  | 7.50% |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  |  | 50,000,000 |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  |  | $ 50,000,000 |  |  |

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