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Summary of Significant Accounting Policies (Summary of Changes in Accumulated Balances of Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Beginning Balance, Estimated tax (expense) benefit |  | $ (616) |  |  | $ (616)
Other comprehensive income (loss) before reclassifications, Estimated tax (expense) benefit |  |  |  |  | (653)
Amount of loss (gain) reclassified from accumulated other comprehensive loss, Estimated tax (expense) benefit |  |  |  |  | 616
Net current period other comprehensive income (loss), Estimated tax (expense) benefit |  |  |  |  | (37)
Ending Balance, Estimated tax (expense) benefit | $ (653) |  |  |  | (653)
Beginning Balance |  | (391,577) |  |  | (391,577)
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  |  | 5,857
Amount of loss (gain) reclassified from accumulated other comprehensive loss, net of tax |  |  |  |  | (2,729)
Net current period other comprehensive income (loss), net of tax | 4,139 | (1,011) | $ (86,878) | $ (16,393) | 3,128
Ending Balance | (388,449) |  |  |  | (388,449)
Unrealized Gains on Investments [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Beginning Balance |  | 3,345 |  |  | 3,345
Other comprehensive income (loss) before reclassifications, before tax |  |  |  |  | 3,157
Amount of loss (gain) reclassified from accumulated other comprehensive loss, before tax |  |  |  |  | (3,345)
Net current period other comprehensive income (loss), before tax |  |  |  |  | (188)
Ending Balance | 3,157 |  |  |  | 3,157
Foreign Currency Translation [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Beginning Balance |  | $ (394,306) |  |  | (394,306)
Other comprehensive income (loss) before reclassifications, before tax |  |  |  |  | 3,353
Net current period other comprehensive income (loss), before tax |  |  |  |  | 3,353
Ending Balance | $ (390,953) |  |  |  | $ (390,953)

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