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Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 3,672 | $ 1,578 | $ 10,277 | $ 9,581
Continuing operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 2,627 | 1,244 | 7,899 | 7,537
Continuing operations | Stock options, net of estimated forfeitures |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 297 | 581 | 1,024 | 2,411
Continuing operations | Restricted stock awards |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 2,330 | 663 | 6,875 | 5,126
Discontinued operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 1,045 | $ 334 | $ 2,378 | $ 2,044

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