Finance Receivables - Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 220,549	$ 229,901	$ 205,350
Total Finance Receivables	7,714,156	7,411,816	7,497,009
Current
Financing Receivable, Recorded Investment, Past Due
Current	7,493,607	7,181,915	7,291,659
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	134,689	137,467	128,623
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	48,242	50,098	44,923
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	37,618	42,336	31,804
Retail
Financing Receivable, Recorded Investment, Past Due
Total Past Due	217,712	228,015	204,574
Total Finance Receivables	6,642,809	6,328,201	6,508,670
Retail | Current
Financing Receivable, Recorded Investment, Past Due
Current	6,425,097	6,100,186	6,304,096
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	134,074	136,945	128,123
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	48,033	49,825	44,808
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	35,605	41,245	31,643
Wholesale
Financing Receivable, Recorded Investment, Past Due
Total Past Due	2,837	1,886	776
Total Finance Receivables	1,071,347	1,083,615	988,339
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due
Current	1,068,510	1,081,729	987,563
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	615	522	500
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	209	273	115
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 2,013	$ 1,091	$ 161