Debt And Capital Lease Obligations (Details Of Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Current Outstanding	$ 231,181	$ 203,199
Long-term Outstanding	1,165,324	1,058,754
Short Term Line Of Credit [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 75,000	$ 75,000
Average Interest (in hundredths)	1.50%	1.50%
Agreement Terminates	May 01, 2016
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 7,000
Long-term Outstanding	$ 383,000	$ 289,000
Average Interest (in hundredths)	1.70%	1.90%
Agreement Terminates	Mar. 01, 2020
Revolving Credit Facility [Member] | CAI Rail Inc [Member]
Debt Instrument [Line Items]
Long-term Outstanding	$ 118,000	$ 61,769
Average Interest (in hundredths)	1.90%	1.90%
Agreement Terminates	Jul. 01, 2019
Term Loan [Member] | Development Bank of Japan [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 1,800	$ 1,800
Long-term Outstanding	$ 24,600	$ 25,500
Average Interest (in hundredths)	2.30%	2.20%
Agreement Terminates	Apr. 01, 2018
Term Loan [Member] | Consortium of Banks [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 9,000	$ 9,000
Long-term Outstanding	$ 134,250	$ 138,750
Average Interest (in hundredths)	1.90%	1.80%
Agreement Terminates	Oct. 01, 2019
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	$ 104,410	$ 109,380
Average Interest (in hundredths)	1.90%	1.90%
Agreement Terminates	Apr. 01, 2017
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 8,240	$ 8,240
Long-term Outstanding	$ 74,160	$ 78,280
Average Interest (in hundredths)	4.90%	4.90%
Agreement Terminates	Sep. 01, 2022
Asset-Backed Notes [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 40,000	$ 40,000
Long-term Outstanding	$ 262,875	$ 282,875
Average Interest (in hundredths)	3.40%	3.40%
Agreement Terminates	Mar. 01, 2028
Collateralized Financing Obligations [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 78,372	$ 57,390
Long-term Outstanding	$ 56,927	$ 65,184
Average Interest (in hundredths)	0.80%	0.80%
Agreement Terminates	Jun. 01, 2019
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Current Outstanding	$ 1,829	$ 1,829
Long-term Outstanding	$ 7,102	$ 8,016
Average Interest (in hundredths)	2.50%	2.60%
Agreement Terminates	Jun. 01, 2019