Consolidation Of Variable Interest Entities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item
Variable Interest Entity [Line Items]
Net book value	$ 2,265,260,000	$ 2,004,961,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	71,958,000	61,842,000
Cash	25,211,000	$ 20,685,000	$ 30,449,000	$ 35,106,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	107,200,000
Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 1,500,000
Containers [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of types of container fund arrangements | item	2
Number of container portfolios sold | item		0	0	0
Net book value	$ 85,800,000
Gain (loss) recognized on initial consolidation of VIEs	0
Carrying value of assets sold	$ 40,600,000	$ 20,500,000	$ 36,200,000