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Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventories [Abstract] |  |  |
Finished goods | $ 218,000 |  | $ 209,800
Work in process | 9,029 |  | 7,536
Raw materials | 104,424 |  | 109,075
Subtotal | 331,453 |  | 326,411
Unreturned customer inventories | 18,246 | [1] | 0
Total inventories | $ 349,699 |  | $ 326,411
[1] | The adoption of ASU 2014-09 using the modified retrospective method resulted in the recording of unreturned customer inventories commencing on January 1, 2018, see Note 2, "Summary of Significant Accounting Policies" for additional information.

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