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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