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Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance |  | $ 183,914
Disposals and Impairments |  | (93,634)
Cumulative Translation Adjustment |  | 365
Goodwill - Ending Balance | $ 90,645 | $ 90,645
Goodwill |  |
Long-term growth rate used to calculate terminal values for each reporting unit (as a percent) |  | 2.00%
Goodwill impairments | 93,634 | $ 93,634
U.S. Drilling |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance |  | 50,149
Other Adjustment |  | 2,054
Goodwill - Ending Balance | 52,203 | 52,203
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 |  | (75,634)
Goodwill |  |
Goodwill impairments | 75,600 | 75,600
Drilling Solutions |  |
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments |  |
Goodwill - Beginning Balance |  | 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 |  | 46,695
Disposals and Impairments |  | (18,000)
Cumulative Translation Adjustment |  | 365
Other Adjustment |  | (2,054)
Goodwill - Ending Balance | 27,006 | 27,006
Goodwill |  |
Goodwill impairments | $ 18,000 | $ 18,000

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