Debt And Capital Lease Obligations (Details Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Current Outstanding	$ 74,280	$ 61,044
Long-term Outstanding	1,072,630	888,990
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Outstanding	253,000	160,000
Average Interest (in hundredths)	2.20%	3.00%
Agreement Terminates	Mar. 01, 2018
Revolving Credit Facility [Member] | CAI Rail Inc [Member]
Debt Instrument [Line Items]
Long-term Outstanding	41,469	41,469
Average Interest (in hundredths)	2.40%	2.50%
Agreement Terminates	Jun. 01, 2015
Term Loan [Member] | Development Bank of Japan [Member]
Debt Instrument [Line Items]
Current Outstanding	8,600	800
Long-term Outstanding	27,750	6,600
Average Interest (in hundredths)	2.30%	2.70%
Agreement Terminates	Apr. 01, 2018
Term Loan [Member] | Consortium of Banks [Member]
Debt Instrument [Line Items]
Current Outstanding	7,500	24,964
Long-term Outstanding	113,750	230,651
Average Interest (in hundredths)	2.50%	3.30%
Agreement Terminates	Dec. 01, 2016
Term Loan [Member] | Consortium of Banks, Note Dated April 11, 2012 [Member]
Debt Instrument [Line Items]
Current Outstanding	9,940	9,940
Long-term Outstanding	121,805	129,260
Average Interest (in hundredths)	2.30%	2.50%
Agreement Terminates	Apr. 01, 2017
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Current Outstanding	8,240	8,240
Long-term Outstanding	86,520	94,760
Average Interest (in hundredths)	4.90%	4.90%
Agreement Terminates	Sep. 01, 2022
Asset-backed Securities [Member]
Debt Instrument [Line Items]
Current Outstanding	40,000	17,100
Long-term Outstanding	332,875	151,050
Average Interest (in hundredths)	3.40%	3.50%
Agreement Terminates	Mar. 01, 2028
Collateralized Financing Obligation [Member]
Debt Instrument [Line Items]
Long-term Outstanding	$ 95,461	$ 75,200
Average Interest (in hundredths)	1.00%	1.10%
Agreement Terminates	Nov. 01, 2016