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Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 3,202 | $ 4,621 | $ 4,778 | $ 6,605
Continuing operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 2,617 | 3,733 | 3,951 | 5,272
Continuing operations | Stock options, net of estimated forfeitures |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 101 | 382 | 277 | 727
Continuing operations | Restricted stock awards |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 2,516 | 3,351 | 3,674 | 4,545
Discontinued operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 585 | $ 888 | $ 827 | $ 1,333

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