Asset-Backed Financing (Schedule Of Secured Notes With Related Maturity) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2014	Dec. 31, 2015
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| Secured Notes Issued May 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000
Weighted average interest rate at date of issuance		0.88%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| Secured Notes Issued April 2014 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 850,000
Weighted average interest rate at date of issuance		0.66%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| Secured Notes Issued April 2013 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 650,000
Weighted average interest rate at date of issuance		0.57%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| Secured Notes Issued January 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 700,000
Weighted average interest rate at date of issuance		0.89%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| August 2013 - June 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 675,306
Weighted average interest rate at date of issuance		0.59%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| November 2012 - February 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 513,300
Weighted average interest rate at date of issuance		0.88%
Variable Interest Entity, Primary Beneficiary [Member] \| Secured Debt [Member] \| September 2012 - August 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 573,380
Weighted average interest rate at date of issuance		0.76%
Variable Interest Entity, Not Primary Beneficiary [Member] \| Foreign Line of Credit [Member] \| Asset-backed Canadian Commercial Paper Conduit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Sale of Finance Receivables	$ 85,000
Face Amount of Finance Receivables Transferred	$ 97,100	$ 87,500
Weighted average interest rate at date of issuance	2.03%	1.80%

Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107207-111719

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- Definition

Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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