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Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | $ 1,593,147
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive income before reclassifications | 2,082
Amounts reclassified from accumulated other comprehensive loss | 178
Net current-period other comprehensive income | 2,260
Ending balance | 1,634,501
Foreign Currency Translation Adjustments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (31,587)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive income before reclassifications | 520
Amounts reclassified from accumulated other comprehensive loss | 0
Net current-period other comprehensive income | 520
Ending balance | (31,067)
Unrealized Gains (Losses) on Investments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (1,413)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive income before reclassifications | 1,562
Amounts reclassified from accumulated other comprehensive loss | 178
Net current-period other comprehensive income | 1,740
Ending balance | 327
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (33,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Ending balance | $ (30,740)

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