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Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | $ 1,476,839
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive loss before reclassifications | (8,923)
Amounts reclassified from accumulated other comprehensive loss | (32)
Net current-period other comprehensive loss | (8,955)
Ending balance | 1,630,510
Foreign Currency Translation Adjustments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (19,522)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive loss before reclassifications | (7,261)
Amounts reclassified from accumulated other comprehensive loss | 0
Net current-period other comprehensive loss | (7,261)
Ending balance | (26,783)
Unrealized Gains (Losses) on Investments |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (386)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Other comprehensive loss before reclassifications | (1,662)
Amounts reclassified from accumulated other comprehensive loss | (32)
Net current-period other comprehensive loss | (1,694)
Ending balance | (2,080)
Accumulated Other Comprehensive Loss |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |
Beginning balance | (19,908)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |
Ending balance | $ (28,863)

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