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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Significant Accounting Policies |
Inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 |  | 2019 |
​ | ​ | (In thousands) |
Raw materials | ​ | $ | 133,424 | ​ | $ | 130,414 | ​
Work-in-progress | ​ |  | 3,452 | ​ |  | 5,498 | ​
Finished goods | ​ |  | 23,709 | ​ |  | 40,429 | ​
​ | ​ | $ | 160,585 | ​ | $ | 176,341 | ​
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Acquisitions |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Balance at | ​ | Purchase | ​ | Disposals | ​ | Cumulative | ​ | ​ | ​ | Balance at |
​ | ​ | December 31, | ​ | Price | ​ | and | ​ | Translation | ​ | Other | ​ | December 31, |
​ | ​ | 2018 | ​ | Adjustments | ​ | Impairments | ​ | Adjustment | ​ | Adjustments | ​ | 2019 |
​ | ​ | (In thousands) |
U.S. Drilling | ​ | $ | 50,149 | ​ | $ | — | ​ | $ | (52,203) | (1) | $ | — | ​ | $ | 2,054 | ​ | $ | — | ​
International Drilling | ​ | ​ | 75,634 | ​ | ​ | — | ​ | ​ | (75,634) | (1) | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Drilling Solutions | ​ | ​ | 11,436 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,436 | ​
Rig Technologies | ​ |  | 46,695 | ​ |  | — | ​ |  | (28,136) | (1) |  | 439 | ​ |  | (2,054) | ​ |  | 16,944 | ​
Total | ​ | $ | 183,914 | ​ | $ | — | ​ | $ | (155,973) | ​ | $ | 439 | ​ | $ | — | ​ | $ | 28,380 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Acquisitions |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
​ | ​ | ​ | ​ | ​ | and | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
​ | ​ | Balance at | ​ | Purchase | ​ | Disposals | ​ | Cumulative | ​ | ​ | ​ | Balance at |
​ | ​ | December 31, | ​ | Price | ​ | and | ​ | Translation | ​ | Other | ​ | December 31, |
​ | ​ | 2019 | ​ | Adjustments | ​ | Impairments | ​ | Adjustment | ​ | Adjustment | ​ | 2020 |
​ | ​ | (In thousands) |
Drilling Solutions | ​ | $ | 11,436 | ​ | $ | — | ​ | $ | (11,436) | (2) | $ | — | ​ |  | — | ​ | $ | — | ​
Rig Technologies | ​ |  | 16,944 | ​ |  | — | ​ |  | (16,362) | (2) |  | (582) | ​ |  | — | ​ |  | — | ​
Total | ​ | $ | 28,380 | ​ | $ | — | ​ | $ | (27,798) | ​ | $ | (582) | ​ | $ | — | ​ | $ | — | ​
| (1) | We determined the carrying value of some of our reporting units exceeded their fair value in 2019. As such, we recognized a goodwill impairment of $156.0 million. See Note 3—Impairments and Other Charges.
| (2) | Due to industry conditions that existed at March 31, 2020, we performed a quantitative impairment assessment of goodwill. Based on the results, we recognized a goodwill impairment of $27.8 million. See Note 3
—Impairments and Other Charges.

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