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Quarterly Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | $ 4,349 | $ (13,324) | $ 8,750 | $ (23,258) | $ 18,137
Stock-based compensation | 18,408 | 1,534 | 31,040 | 18,416 | 24,350
Goodwill and other asset impairment | 5,875 | 56,732 | 7,819 | 80,057 | $ 4,415
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (2,830) | 49,447 |  |  |
Contingent Payment |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
(Income) loss attributable to fair value adjustments | $ 9,030 | $ (8,979) | $ 5,403 | $ (3,679) |

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