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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Inventory Disclosure [Abstract] |
Components of Inventories | The components of inventories consisted of the following:
|  | December 31, |
(in thousands) |  | 2018 |  |  | 2017 |
Raw materials |  | $ | 16,629 |  |  | $ | 17,550 |
Work in process (1) |  |  | — |  |  |  | — |
Inventories |  | $ | 16,629 |  |  | $ | 17,550 |
(1) | Upon the adoption of Topic 606, the deferred incremental costs of obtaining and fulfilling contracts that were previously reported in Inventories under “Work in process” are currently reported under “Current contract costs” and “Other investments and assets.” Refer to Note 2 – Revenue and Related Contract Costs and Contract Liabilities for additional information.

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