Consolidation Of Variable Interest Entities (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($) item	Dec. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Net book value	$ 1,864,337,000		$ 1,864,337,000		$ 1,807,010,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	84,400,000		84,400,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	57,697,000		57,697,000		62,477,000
Cash	15,461,000		15,461,000		$ 30,449,000
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	4,700,000		$ 4,700,000
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
Net book value	65,900,000		$ 65,900,000
Cash	15,500,000		15,500,000
Gain (loss) recognized on initial consolidation of VIEs			0
Book value of containers sold	$ 7,200,000	$ 6,200,000	$ 7,200,000	$ 16,900,000