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Earnings (Loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Weighted-Average Number of Shares Outstanding
The following table summarizes the basic and diluted weighted average common shares outstanding and the weighted average common shares excluded from the calculation of diluted weighted average common shares outstanding due to the anti-dilutive effect for the periods presented (in thousands):
SuccessorPredecessor
 Period from November 20, 2020 through
December 31, 2020
Period from January 1, 2020 through
November 19, 2020
Year Ended December 31,
 20192018
Weighted average common shares outstanding:
Basic and diluted19,991 317,644 315,002 307,480 
Anti-dilutive weighted average common shares:
Unvested restricted stock awards and PSUs5,216 9,242 6,980