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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
	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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