Restructuring Expenses (Restructuring Plan Reserve Recorded in Accrued Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Restructuring Reserve [Roll Forward]
Restructuring expense	$ 13,630	$ 46,842
Motorcycles and Related Products
Restructuring Reserve [Roll Forward]
Balance, beginning of period	25,037	0
Restructuring expense	14,024	46,842
Utilized - cash	(8,128)	(2,674)
Utilized - non cash	(8,379)	(5,613)
Foreign currency changes	34	(205)
Balance, end of period	22,588	38,350
Motorcycles and Related Products | Employee Severance
Restructuring Reserve [Roll Forward]
Balance, beginning of period	24,958	0
Restructuring expense	9	40,791
Utilized - cash	(2,600)	(2,300)
Utilized - non cash	0	0
Foreign currency changes	34	(204)
Balance, end of period	22,401	38,287
Motorcycles and Related Products | Accelerated Depreciation
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0	0
Restructuring expense	8,379	5,613
Utilized - cash	0	0
Utilized - non cash	(8,379)	(5,613)
Foreign currency changes	0	0
Balance, end of period	0	0
Motorcycles and Related Products | Project Implementation Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	79	0
Restructuring expense	5,636	438
Utilized - cash	(5,528)	(374)
Utilized - non cash	0	0
Foreign currency changes	0	(1)
Balance, end of period	187	63
Motorcycles And Related Products Operations
Restructuring Reserve [Roll Forward]
Balance, beginning of period	28,498	0
Restructuring expense	13,630	46,842
Utilized - cash	(10,142)	(2,674)
Utilized - non cash	(8,379)	(5,613)
Foreign currency changes	32	(205)
Balance, end of period	23,639	38,350
Motorcycles And Related Products Operations | 2018 Reorganization Plan
Restructuring Reserve [Roll Forward]
Balance, beginning of period	3,461	0
Restructuring expense	(394)	0
Utilized - cash	(2,014)	0
Utilized - non cash	0	0
Foreign currency changes	(2)	0
Balance, end of period	$ 1,051	$ 0