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Income Taxes - Schedule of Income Tax Expense (Benefit) and Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income (Loss) from Continuing Operations Before Income Tax |  |  |
United States | $ (85,342) | $ (167,908) | $ (128,396)
Foreign | (8,341) | 81,369 | (53,326)
Loss before income tax expense (benefit) | (93,683) | (86,539) | (181,722)
Current |  |  |
U.S. federal | 0 | 0 | (13,389)
U.S. state and local | 7 | (15) | 379
Foreign | 11,677 | 10,516 | 14,903
Total current | 11,684 | 10,501 | 1,893
Deferred |  |  |
U.S. federal | 0 | 56,621 | (25,838)
U.S. state and local | 0 | 2,420 | (1,512)
Foreign | (14,634) | 3,376 | (186)
Total deferred | (14,634) | 62,417 | (27,536)
Total income tax expense (benefit) | (2,950) | 72,918 | $ (25,643)
Valuation allowance | 84,972 | 60,524 |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 326,700 |  |
Unrecognized tax benefits | 300 | $ 200 |
Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforwards | $ 609 |  |

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