Reportable Segments and Geographic Information (Information By Industry Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 9,972,672	$ 9,890,240	$ 9,972,977
Depreciation and amortization	222,188	209,555	198,074
Capital expenditures	206,294	256,263	259,974
Motorcycles
Segment Reporting Information [Line Items]
Total assets	2,449,603	2,490,450	2,522,249
Depreciation and amortization	215,639	202,122	188,926
Capital expenditures	193,204	245,316	249,772
Financial Services
Segment Reporting Information [Line Items]
Total assets	7,523,069	7,399,790	7,450,728
Depreciation and amortization	6,549	7,433	9,148
Capital expenditures	$ 13,090	$ 10,947	$ 10,202