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Share-Based Payments - Stock Option and Restricted Stock Unit Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 13,770 | $ 17,029 | $ 36,187 | $ 47,582
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 2,751 | 3,446 | 6,125 | 9,262
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 11,019 | $ 13,583 | $ 30,062 | $ 38,320

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