Debt And Capital Lease Obligations (Details Of Debt) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Current Outstanding	$ 73,880	$ 74,080
Long-term Outstanding	1,086,432	1,058,628
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Outstanding	271,500	235,000
Average Interest (in hundredths)	1.90%	1.90%
Agreement Terminates	Mar. 01, 2018
Revolving Credit Facility [Member] | CAI Rail Inc [Member]
Debt Instrument [Line Items]
Long-term Outstanding	56,969	54,469
Average Interest (in hundredths)	2.40%	2.40%
Agreement Terminates	Jun. 01, 2015
Term Loan [Member] | Development Bank of Japan [Member]
Debt Instrument [Line Items]
Current Outstanding	8,200	8,400
Long-term Outstanding	26,850	27,300
Average Interest (in hundredths)	2.30%	2.30%
Agreement Terminates	Apr. 01, 2018
Term Loan [Member] | Consortium of Banks [Member]
Debt Instrument [Line Items]
Current Outstanding	7,500	7,500
Long-term Outstanding	110,000	111,875
Average Interest (in hundredths)	2.50%	2.50%
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	116,835	119,320
Average Interest (in hundredths)	2.20%	2.20%
Agreement Terminates	Apr. 01, 2017
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Current Outstanding	8,240	8,240
Long-term Outstanding	82,400	86,520
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	40,000
Long-term Outstanding	312,875	322,875
Average Interest (in hundredths)	3.40%	3.40%
Agreement Terminates	Mar. 01, 2028
Collateralized Financing Obligation [Member]
Debt Instrument [Line Items]
Long-term Outstanding	$ 109,003	$ 101,269
Average Interest (in hundredths)	1.00%	1.00%
Agreement Terminates	Mar. 01, 2017