Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (Railcar Segment [Member], USD $)	0 Months Ended	1 Months Ended	9 Months Ended			9 Months Ended
	Mar. 01, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Feb. 28, 2007 Senior unsecured notes [Member]	Sep. 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						196,000,000	100,000,000
Debt Instrument, Basis Spread on Variable Rate						2.50%
Pledged assets						222,000,000	112,000,000
Repayments of debt	175,000,000	100,000,000
Gains (Losses) on Extinguishment of Debt			1,000,000	2,000,000
Gross proceeds from sale of senior unsecured notes						$ 100,000,000