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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ (361,888) | $ (333,154)
Ending balance | (1,264,026) | (361,888)
Foreign Currency Translation Adjustments [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 1,273 | 1,079
Net current period other comprehensive income (loss) | (709) | 194
Reclassifications | 0 | 0
Ending balance | 564 | 1,273
Net Unrealized (Gains) Losses on Marketable Securities [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (10) | 126
Net current period other comprehensive income (loss) | 44 | (136)
Reclassifications | 0 | 0
Ending balance | 34 | (10)
Accumulated Other Comprehensive Loss (Income) [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 1,263 | 1,205
Net current period other comprehensive income (loss) | (665) | 58
Reclassifications | 0 | 0
Ending balance | $ 598 | $ 1,263

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