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Acquisitions (Details) - USD ($) $ in Thousands | Sep. 05, 2017 | Aug. 13, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Acquisitions |  |  |  |
Goodwill |  |  | $ 173,321 | $ 166,917
Stavanger Based Robotic Drilling Systems AS |  |  |  |
Acquisitions |  |  |  |
Cash paid for acquisitions of businesses | $ 50,900 |  |  |
Recorded intangible assets | 53,300 |  |  |
Goodwill | 5,700 |  |  |
Other liabilities | $ 7,300 |  |  |
Common Shares | Tesco Corporation |  |  |  |
Acquisitions |  |  |  |
Number of shares exchanged per common stock of acquiree |  | 0.68 |  |
Number of common shares to be issued |  | 32,000,000 |  |

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