Consolidation Of Variable Interest Entities (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($) item	Sep. 30, 2017 USD ($) item	Sep. 30, 2016 USD ($) item	Dec. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Net book value	$ 1,979,012,000		$ 1,979,012,000		$ 1,807,010,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	90,700,000		90,700,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	58,075,000		58,075,000		62,477,000
Cash	22,445,000		22,445,000		$ 30,449,000
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 3,700,000		$ 3,700,000
Variable Interest Entity, Primary Beneficiary [Member] | Containers [Member]
Variable Interest Entity [Line Items]
Number of types of container fund arrangements | item			2
Number of container portfolios sold | item	0	0	0	0
Net book value	$ 66,100,000		$ 66,100,000
Cash	22,400,000		22,400,000
Gain (loss) recognized on initial consolidation of VIEs			0
Book value of containers sold	$ 6,000,000	$ 9,200,000	$ 13,200,000	$ 26,100,000