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Share-based Compensation - Summary of Share-based 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 non-cash stock compensation | $ 1,984 | $ 3,149
Continuing operations |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total non-cash stock compensation | 1,981 | 2,987
Continuing operations | Stock options, net of estimated forfeitures |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total non-cash stock compensation | 439 | 823
Continuing operations | Restricted stock awards |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total non-cash stock compensation | 1,542 | 2,164
Discontinued operations |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total non-cash stock compensation | $ 3 | $ 162

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