Additional Balance Sheet and Cash Flow Information - Inventories, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jul. 01, 2018
Inventory
Raw materials and work in process	$ 161,828	$ 177,110	$ 154,921
Inventory at lower of FIFO cost or net realizable value	529,249	614,767	517,728
Excess of FIFO over LIFO cost	(58,639)	(58,639)	(52,355)
Inventories, net	470,610	556,128	465,373
Motorcycles
Inventory
Finished goods	218,069	301,630	222,711
Parts & accessories and general merchandise
Inventory
Finished goods	$ 149,352	$ 136,027	$ 140,096

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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The aggregate carrying amount as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. Includes supplies used directly or indirectly in the manufacturing or production process. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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