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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of Significant Accounting Policies |
Inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2019 |  | 2018 |
​ | ​ | (In thousands) |
Raw materials | ​ | $ | 130,904 | ​ | $ | 116,840 | ​
Work-in-progress | ​ |  | 14,452 | ​ |  | 20,329 | ​
Finished goods | ​ |  | 33,011 | ​ |  | 28,418 | ​
​ | ​ | $ | 178,367 | ​ | $ | 165,587 | ​
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Balance at | ​ | Disposals | ​ | Cumulative | ​ | ​ | ​ | Balance at |
​ | ​ | December 31, | ​ | and | ​ | Translation | ​ | Other | ​ | June 30, |
​ | ​ | 2018 | ​ | Impairments | ​ | Adjustment | ​ | Adjustment | ​ | 2019 |
​ | ​ | (In thousands) |
U.S. Drilling | ​ | $ | 50,149 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,054 | ​ | $ | 52,203 | ​
International Drilling | ​ | ​ | 75,634 | ​ | ​ | (75,634) | (1) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Drilling Solutions | ​ |  | 11,436 | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 11,436 | ​
Rig Technologies | ​ |  | 46,695 | ​ |  | (18,000) | (1) |  | 365 | ​ |  | (2,054) | ​ |  | 27,006 | ​
Total | ​ | $ | 183,914 | ​ | $ | (93,634) | ​ | $ | 365 | ​ | $ | — | ​ | $ | 90,645 | ​
(1) | As part of our annual review during the second quarter of 2019, we determined the carrying value of some of our reporting units exceeded their fair value. As such, we recognized a goodwill impairment of $93.6 million. See Note 9—Impairments and Other Charges.

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