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, 2016	Dec. 31, 2015
Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	$ 759,984	$ 722,209
Marketable securities	43,638	81,448
Derivatives	29,034	16,235
Finance receivables, net	6,921,037	6,937,053
Restricted cash	67,147	110,642
Liabilities:
Derivatives	142	1,300
Estimate of Fair Value Measurement \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	149,338	153,839
Estimate of Fair Value Measurement \| Secured Debt \| Term asset-backed securitization debt, VIE
Liabilities:
Debt instrument, fair value	797,688	1,455,776
Estimate of Fair Value Measurement \| Medium-term Notes
Liabilities:
Debt instrument, fair value	4,139,462	3,410,966
Estimate of Fair Value Measurement \| Senior Notes
Liabilities:
Debt instrument, fair value	744,552	737,435
Estimate of Fair Value Measurement \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	1,055,708	1,201,380
Carrying Value
Assets:
Cash and cash equivalents	759,984	722,209
Marketable securities	43,638	81,448
Derivatives	29,034	16,235
Finance receivables, net	6,835,458	6,868,153
Restricted cash	67,147	110,642
Liabilities:
Derivatives	142	1,300
Carrying Value \| Secured Debt \| Asset-backed Canadian commercial paper conduit facility
Liabilities:
Debt instrument, fair value	149,338	153,839
Carrying Value \| Secured Debt \| Term asset-backed securitization debt, VIE
Liabilities:
Debt instrument, fair value	796,275	1,459,377
Carrying Value \| Medium-term Notes
Liabilities:
Debt instrument, fair value	4,064,940	3,316,949
Carrying Value \| Senior Notes
Liabilities:
Debt instrument, fair value	741,306	740,653
Carrying Value \| Unsecured Commercial Paper
Liabilities:
Unsecured commercial paper	$ 1,055,708	$ 1,201,380

Restricted Cash and Cash Equivalents, Fair Value Disclosure

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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

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

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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.

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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.

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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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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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