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Share-based Compensation and Equity - Summary of Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total continuing operations |  | $ 10,791 | $ 64,788 | $ 38,809
Employee Time Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total non-cash stock compensation | $ 15,000 |  |  |
Continuing Operations |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total non-cash stock compensation |  | 9,738 | 61,844 | 35,114
Deferred compensation arrangement |  | 0 | 0 | 738
Total continuing operations |  | 9,738 | 61,844 | 35,852
Continuing Operations | Employee Time Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total non-cash stock compensation |  | (3,026) | 48,601 | 25,008
Continuing Operations | Restricted stock and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total non-cash stock compensation |  | 12,764 | 13,243 | 10,106
Discontinued Operations |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total continuing operations |  | $ 1,053 | $ 2,944 | $ 2,957

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