Debt And Derivative Instruments (Schedule Of Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 186,884	$ 222,225
Gross Debt, Long-term Outstanding	1,571,612	1,890,778
Debt discount and debt issuance costs, Current Outstanding	(3,436)	(4,131)
Debt discount and debt issuance costs, Long-term Outstanding	(9,329)	(10,656)
Total Debt, Current Outstanding	183,448	218,094
Total Debt, Long-term Outstanding	1,562,283	1,880,122
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Total Debt, Current Outstanding	41,344	26,931
Total Debt, Long-term Outstanding	59,519	100,849
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Gross Debt, Long-term Outstanding	$ 680,000	$ 624,000
Average Interest	1.60%	3.30%
Maturity	June 2023
Term Loan [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 5,482	$ 5,250
Gross Debt, Long-term Outstanding	$ 25,752	$ 31,234
Average Interest	4.20%	4.20%
Maturity	February 2026
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 6,110	$ 6,110
Gross Debt, Long-term Outstanding	$ 40,555	$ 46,665
Average Interest	4.90%	4.90%
Maturity	September 2022
Collateralized Financing Obligations [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 35,862	$ 21,681
Gross Debt, Long-term Outstanding	$ 33,767	$ 69,615
Average Interest	1.70%	1.50%
Maturity	February 2026
CAI Rail [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Gross Debt, Long-term Outstanding		$ 137,500
Average Interest		3.30%
Maturity	-
CAI Euro [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 21,537
Gross Debt, Long-term Outstanding	$ 23,550
Average Interest	2.50%	2.00%
Maturity	September 2023
Term Loan Due April 2023 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 1,800	$ 1,800
Gross Debt, Long-term Outstanding	$ 23,700	$ 25,500
Average Interest	2.20%	3.90%
Maturity	April 2023
Term Loan Due June 2021 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 68,500	$ 7,000
Gross Debt, Long-term Outstanding		$ 68,500
Average Interest	1.90%	3.50%
Maturity	June 2021
Term Loan 3.4% [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 15,284
Average Interest		3.40%
Maturity	-
Term Loan 3.6% [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 3,016
Gross Debt, Long-term Outstanding		$ 37,635
Average Interest		3.60%
Maturity	-
Term Loan Due October 2023 [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 6,000	$ 6,000
Gross Debt, Long-term Outstanding	$ 80,500	$ 86,500
Average Interest	4.60%	4.60%
Maturity	October 2023
Series 2012-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 17,100
Gross Debt, Long-term Outstanding		$ 31,350
Average Interest		3.50%
Maturity	-
Series 2013-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 22,900
Gross Debt, Long-term Outstanding		$ 51,525
Average Interest		3.40%
Maturity	-
Series 2017-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 25,307
Gross Debt, Long-term Outstanding		$ 164,496
Average Interest		3.70%
Maturity	-
Series 2018-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 34,890
Gross Debt, Long-term Outstanding		$ 250,045
Average Interest		4.00%
Maturity	-
Series 2018-2 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding		$ 34,350
Gross Debt, Long-term Outstanding		$ 266,213
Average Interest		4.40%
Maturity	-
Series 2020-1 Asset-Backed Notes [Member] | Asset Backed Notes [Member]
Debt Instrument [Line Items]
Gross Debt, Current Outstanding	$ 63,130
Gross Debt, Long-term Outstanding	$ 663,788
Average Interest	2.30%
Maturity	September 2045