Fair Value Of Financial Instruments (Summary Of The Fair Value And Carrying Value Of The Company's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Restricted cash	$ 98,627	$ 144,807
Estimate of Fair Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	906,680	1,066,612
Marketable securities	91,140	129,181
Accounts receivable, net	247,621	261,065
Derivatives, Assets	32,244	1,932
Finance receivables, net	6,519,500	6,086,441
Restricted cash	122,052	144,807
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Accounts payable	196,868	239,794
Derivatives, Liabilities	2,027	3,925
Estimate of Fair Value Measurement [Member] \| Unsecured Commercial Paper [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	731,786	666,317
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	166,912	174,241
Estimate of Fair Value Measurement [Member] \| Medium-term Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	3,502,536	3,087,852
Estimate of Fair Value Measurement [Member] \| Senior Unsecured Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	0	305,958
Estimate of Fair Value Measurement [Member] \| Secured Debt [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	1,270,656	1,259,314
Reported Value Measurement [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents	906,680	1,066,612
Marketable securities	91,140	129,181
Accounts receivable, net	247,621	261,065
Derivatives, Assets	32,244	1,932
Finance receivables, net	6,432,881	5,999,563
Restricted cash	122,052	144,807
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Accounts payable	196,868	239,794
Derivatives, Liabilities	2,027	3,925
Reported Value Measurement [Member] \| Unsecured Commercial Paper [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	731,786	666,317
Reported Value Measurement [Member] \| Asset-backed Canadian Commercial Paper Conduit Facility [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	166,912	174,241
Reported Value Measurement [Member] \| Medium-term Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	3,334,398	2,858,980
Reported Value Measurement [Member] \| Senior Unsecured Notes [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	0	303,000
Reported Value Measurement [Member] \| Secured Debt [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt instrument, fair value	$ 1,271,533	$ 1,256,632

Fair value portion of liabilities incurred for goods and services received that are used in an entity's business and related party payables.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 14

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

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-Topic 210

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- Definition

Fair value portion of amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties.

+ References

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- Definition

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.

+ References

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

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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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- Definition

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

+ References

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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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-Topic 210

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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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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 Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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-Glossary Trading Securities

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- Definition

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.

+ References

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