Fair Value Of Financial Instruments (Summary Of The Fair Value And Carrying Value Of The Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Restricted cash	$ 88,267	$ 98,627
Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	722,209	906,680
Marketable securities	81,448	91,140
Derivatives, Assets	16,235	32,244
Finance receivables, net	6,937,053	6,519,500
Restricted cash	110,642	122,052
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivatives, Liabilities	1,300	2,027
Estimate of Fair Value Measurement [Member] \| Unsecured Commercial Paper [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	1,201,380	731,786
Estimate of Fair Value Measurement [Member] \| Asset-backed Canadian Commercial Paper Conduit Facility [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	153,839	166,912
Estimate of Fair Value Measurement [Member] \| Medium-term Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	3,410,966	3,502,536
Estimate of Fair Value Measurement [Member] \| Senior Unsecured Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	737,435	0
Estimate of Fair Value Measurement [Member] \| Secured Debt [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	1,455,776	1,270,656
Reported Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	722,209	906,680
Marketable securities	81,448	91,140
Derivatives, Assets	16,235	32,244
Finance receivables, net	6,868,153	6,432,881
Restricted cash	110,642	122,052
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Derivatives, Liabilities	1,300	2,027
Reported Value Measurement [Member] \| Unsecured Commercial Paper [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	1,201,380	731,786
Reported Value Measurement [Member] \| Asset-backed Canadian Commercial Paper Conduit Facility [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	153,839	166,912
Reported Value Measurement [Member] \| Medium-term Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	3,325,081	3,334,398
Reported Value Measurement [Member] \| Senior Unsecured Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	746,934	0
Reported Value Measurement [Member] \| Secured Debt [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	$ 1,463,154	$ 1,271,533

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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+ References

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- References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
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-Subparagraph a, f, g
-Article 7

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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