Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net cash provided by operating activities (Note 2)	$ 1,174,339	$ 1,100,118	$ 1,146,677
Cash flows from investing activities:
Capital expenditures	(256,263)	(259,974)	(232,319)
Origination of finance receivables	(3,664,495)	(3,751,830)	(3,568,423)
Collections on finance receivables	3,175,031	3,136,885	3,013,245
Proceeds from finance receivables sold	312,571	0	0
Sales and redemptions of marketable securities	40,014	11,507	41,010
Acquisition of business	0	(59,910)	0
Other	411	7,474	1,837
Net cash used by investing activities	(392,731)	(915,848)	(744,650)
Cash flows from financing activities:
Proceeds from issuance of medium-term notes	1,193,396	595,386	991,835
Repayments of medium-term notes	(451,336)	(610,331)	(526,431)
Proceeds from issuance of senior unsecured notes	0	740,385	0
Repayment of senior unsecured notes	0	0	(303,000)
Proceeds from securitization debt	0	1,195,668	847,126
Repayments of securitization debt	(665,400)	(1,008,135)	(834,856)
Borrowings of asset-backed commercial paper	62,396	87,442	84,907
Repayments of asset-backed commercial paper	(71,500)	(72,727)	(77,800)
Net increase in credit facilities and unsecured commercial paper	(145,812)	469,473	63,945
Net change in restricted cash	43,495	11,410	22,755
Dividends paid	(252,321)	(249,262)	(238,300)
Purchase of common stock for treasury	(465,341)	(1,537,020)	(615,602)
Excess tax benefits from share-based payments	2,251	3,468	11,540
Issuance of common stock under employee stock option plans	15,782	20,179	37,785
Net cash used by financing activities	(734,390)	(354,064)	(536,096)
Effect of exchange rate changes on cash and cash equivalents	(9,443)	(14,677)	(25,863)
Net increase (decrease) in cash and cash equivalents	37,775	(184,471)	(159,932)
Cash and cash equivalents:
Cash and cash equivalents—beginning of period	722,209	906,680	1,066,612
Net increase (decrease) in cash and cash equivalents	37,775	(184,471)	(159,932)
Cash and cash equivalents—end of period	$ 759,984	$ 722,209	$ 906,680