Additional Balance Sheet and Cash Flow Information (Reconciliation Of Net Income (Loss) To Net Cash Provided By Operating Activities Of Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 521,759	$ 692,164	$ 752,207
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	222,188	209,555	198,074
Amortization of deferred loan origination costs	82,911	86,681	93,546
Amortization of financing origination fees	8,045	9,252	9,975
Provision for long-term employee benefits	29,900	38,273	60,824
Employee benefit plan contributions and payments	(63,277)	(55,809)	(28,490)
Stock compensation expense	32,491	32,336	29,433
Net change in wholesale finance receivables related to sales	35,172	(3,233)	(113,970)
Provision for credit losses	132,444	136,617	101,345
Gain on off-balance sheet asset-backed securitization	0	(9,269)	0
Loss on debt extinguishment	0	118	1,099
Deferred income taxes	50,855	(165)	(16,484)
Other, net	8,559	(6,907)	20,913
Changes in current assets and liabilities:
Accounts receivable, net	(18,149)	(45,934)	(13,665)
Finance receivables – accrued interest and other	(1,313)	(1,489)	(3,046)
Inventories	(20,584)	85,072	(155,222)
Accounts payable and accrued liabilities	10,128	38,237	138,823
Derivative instruments	1,866	(3,413)	(5,615)
Other	(27,934)	(27,747)	30,371
Total adjustments	483,302	482,175	347,911
Net cash provided by operating activities	1,005,061	1,174,339	1,100,118
Supplemental Cash Flow Information [Abstract]
Interest	204,866	185,804	148,654
Income taxes	$ 300,113	$ 356,553	$ 371,547