Asset-Backed Financing (Schedule Of Assets And Liabilities Of Variable Interest Entities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	$ 1,782,332	$ 1,643,701
Financing Receivable [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,611,624	1,458,602
Financing Receivable [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0	0
Financing Receivable [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	170,708	185,099
Allowance for Credit Loss [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(40,998)	(35,121)
Allowance for Credit Loss [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(37,937)	(32,156)
Allowance for Credit Loss [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	0	0
Allowance for Credit Loss [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	(3,061)	(2,965)
Restricted Cash [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	110,642	122,052
Restricted Cash [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	100,151	110,017
Restricted Cash [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0	0
Restricted Cash [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	10,491	12,035
Other Assets [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	5,099	3,671
Other Assets [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	4,383	2,987
Other Assets [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	323	422
Other Assets [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	393	262
Assets, Total [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,857,075	1,734,303
Assets, Total [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,678,221	1,539,450
Assets, Total [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	323	422
Assets, Total [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	178,531	194,431
Asset-Backed Debt [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,616,993	1,438,445
Asset-Backed Debt [Member] | Asset-backed Securities [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	1,463,154	1,271,533
Asset-Backed Debt [Member] | Asset-backed U.S. Commercial Paper Conduit Facility [Member] | SPEs [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	0	0
Asset-Backed Debt [Member] | Asset-backed Canadian Commercial Paper Conduit Facility [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount	$ 153,839	$ 166,912