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Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 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 gain before reclassifications | 2,020
Amounts reclassified from accumulated other comprehensive loss | (273)
Net current-period other comprehensive gain | 1,747
Ending balance | 1,613,654
Foreign Currency Translation Adjustments [Member] |
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 gain before reclassifications | 3,377
Amounts reclassified from accumulated other comprehensive loss | 0
Net current-period other comprehensive gain | 3,377
Ending balance | (16,145)
Unrealized Gains (Losses) on Investments [Member] |
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 gain before reclassifications | (1,357)
Amounts reclassified from accumulated other comprehensive loss | (273)
Net current-period other comprehensive gain | (1,630)
Ending balance | (2,016)
Accumulated Other Comprehensive Loss [Member] |
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 | $ (18,161)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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