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Income Taxes - Uncertain Tax Position (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
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Gross unrecognized tax benefits as of January 1 | $ 3,348 |  |  |  | $ 3,348 |  |
Increase in current year tax positions |  |  |  |  | 2,162 |  |
Acquired tax positions |  |  |  |  | 1,789 |  |
Settlements |  |  |  |  | (787) |  |
Gross unrecognized tax benefits as of December 31 |  | $ 3,348 | $ 6,512 |  | 6,512 | $ 3,348 |
Decrease in unrecognized tax benefits |  |  |  |  | $ 800 |  |

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