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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2015
Equity [Abstract] |  |  |  |
Foreign currency translation adjustments, net of tax | $ (142,255) | $ (280,426) |  |
Net unrealized gain (loss) on available for sale securities, net of tax | (6,678) | 27 |  |
Accumulated other comprehensive loss | (148,933) | (280,399) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net unrealized loss on available-for-sale-securities before tax | 9,000 |  |  |
2.5% Senior Notes Due 2022 |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Foreign currency translation gains (losses), net of tax | 45,000 | (16,000) |  |
Foreign currency translation gains (losses), before tax | $ 71,000 | $ (25,000) |  |
Senior notes, interest rate | 2.50% | 2.50% | 2.50% | 2.50%

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