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Share-Based Compensation - Schedule Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | $ 8,934 | $ 7,675
Direct cost of revenues |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | 5,723 | 5,243
Selling, general and administrative expenses |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expense | $ 3,211 | $ 2,432

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