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Equity (Tables)
12 Months Ended
Dec. 31, 2018
Successor  
Equity, Class of Treasury Stock [Line Items]  
Treasury Stock Activity The following table shows the number of shares withheld for taxes and the associated value of those shares (in thousands). These shares were accounted for as treasury stock when withheld, and then immediately retired.
Successor
Year Ended December 31, 2018Year Ended December 31, 2017 Period from October 2, 2016 through December 31, 2016 
Number of shares withheld for taxes495 349 
Value of shares withheld for taxes$7,420 $6,730 $110 
Predecessor  
Equity, Class of Treasury Stock [Line Items]  
Preferred Stock Dividends
Preferred stock dividend accruals in arrears prior to the Emergence Date for the Predecessor Company’s 8.5% and 7.0% convertible perpetual preferred stock were as follows (in thousands):
Predecessor 
Period from January 1, 2016 through October 1, 2016 
8.5% Convertible perpetual preferred stock 
Dividends in arrears $11,262 
7.0% Convertible perpetual preferred stock 
Dividends in arrears $21,000