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Stock-Based Compensation Plans - PSRUs-settled activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-Based Compensation Plans |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Compensation expense |  | $ 9,400 |  | $ 15,900 | $ 50,700 |  | $ 26,100
Equity-settled PRSUs |  |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  |  |  |  | Successor |  |
Compensation expense |  |  |  |  | $ 25,392 |  |
Income tax benefit |  |  |  |  | $ 4,781 |  |
Options |  |  |  |  |  |  |
Share-Based Compensation Plans |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  |  |  |  | Successor |  |
Compensation expense |  |  |  |  | $ 24,432 |  |
Income tax benefit |  |  |  |  | $ (8,556) |  |

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