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Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Balances of Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,311,192 | $ 1,035,744 | $ 1,020,305
Other comprehensive income (loss) before reclassifications | (8,344) | (483) | (16,889)
Net current period other comprehensive income (loss) | (8,344) | (483) | (16,889)
Ending balance | 1,211,018 | 1,311,192 | 1,035,744
Unrealized Gains (Losses) on Investments |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (275) | (1,418) | 0
Other comprehensive income (loss) before reclassifications | 558 | 1,143 | (1,418)
Net current period other comprehensive income (loss) | 558 | 1,143 | (1,418)
Ending balance | 283 | (275) | (1,418)
Foreign Currency Translation |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (46,187) | (44,561) | (29,090)
Other comprehensive income (loss) before reclassifications | (8,902) | (1,626) | (15,471)
Net current period other comprehensive income (loss) | (8,902) | (1,626) | (15,471)
Ending balance | (55,089) | (46,187) | (44,561)
Accumulated other comprehensive income (loss) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning balance | (46,462) | (45,979) | (29,090)
Net current period other comprehensive income (loss) | (8,344) | (483) | (16,889)
Ending balance | $ (54,806) | $ (46,462) | $ (45,979)

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