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Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 1,578 | $ 6,561 | $ 9,581 | $ 10,492
Continuing operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 1,459 | 6,388 | 9,194 | 9,572
Continuing operations | Stock options, net of estimated forfeitures |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 708 | 1,932 | 2,871 | (3,333)
Continuing operations | Restricted stock awards |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | 751 | 4,456 | 6,323 | 12,905
Discontinued operations |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Total non-cash stock compensation | $ 119 | $ 173 | $ 387 | $ 920

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