Consolidation Of Variable Interest Entities As A Non-Controlling Interest (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item
Variable Interest Entity [Line Items]
Net book value	$ 2,004,961,000	$ 1,807,010,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	92,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	61,842,000	62,477,000
Cash	20,685,000	$ 30,449,000
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 3,300,000
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
Net book value	$ 70,000,000
Gain (loss) recognized on initial consolidation of VIEs	0
Carrying value of assets sold	$ 20,500,000	$ 36,200,000	$ 30,400,000