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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill |  |  |  |  |
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent) |  |  |  | 2.00% |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |  |
Goodwill - Beginning Balance | $ 28,380 |  |  | $ 28,380 | $ 183,914
Disposals and Impairments | (27,800) |  |  | (27,798) | (155,973)
Cumulative Translation Adjustment |  |  |  | (582) | 439
Goodwill - Ending Balance |  | $ 28,380 |  |  | 28,380
U.S. Drilling |  |  |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |  |
Goodwill - Beginning Balance |  |  |  |  | 50,149
Disposals and Impairments |  | (52,200) |  |  | (52,203)
Other Adjustment |  |  |  |  | 2,054
International Drilling |  |  |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |  |
Goodwill - Beginning Balance |  |  |  |  | 75,634
Disposals and Impairments |  |  | $ (75,600) |  | (75,634)
Drilling Solutions |  |  |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |  |
Goodwill - Beginning Balance | 11,436 |  |  | 11,436 | 11,436
Disposals and Impairments |  |  |  | (11,436) |
Goodwill - Ending Balance |  | 11,436 |  |  | 11,436
Rig Technologies |  |  |  |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |  |  |  |
Goodwill - Beginning Balance | $ 16,944 |  |  | 16,944 | 46,695
Disposals and Impairments |  | (10,100) | $ (18,000) | (16,362) | (28,136)
Cumulative Translation Adjustment |  |  |  | $ (582) | 439
Other Adjustment |  |  |  |  | (2,054)
Goodwill - Ending Balance |  | $ 16,944 |  |  | $ 16,944

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