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Share-Based Compensation and Other Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Share-Based Compensation Expense
The following table summarizes our share-based compensation expense (benefit) recognized for the periods presented:
 
Successor
 
 
Predecessor
 
 
 
 
 
September 13 Through
 
 
January 1 Through
 
Year Ended December 31,
 
September 30,
 
 
September 12,
 
2018
 
2017
 
2016
 
 
2016
Equity-classified awards
$
4,618

 
$
3,809

 
$
81

 
 
$
1,511

Liability-classified awards
—

 
—

 


 
 
(19
)
 
$
4,618

 
$
3,809

 
$
81

 
 
$
1,492
Performance Restricted Stock Units [Domain]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Payment Award, Equity Instruments Other than Options, Valuation Assumptions
The ranges for the assumptions used in the Monte Carlo model for the PRSUs granted during 2017 are presented as follows:
Expected volatility
59.63% to 62.18%
Dividend yield
0.0% to 0.0%
Risk-free interest rate
1.44% to 1.51%
Activity of Awarded Performance-based RSUs
The following table summarizes activity for our most recent fiscal year with respect to PRSUs:
 
Performance Restricted Stock
Units
 
Weighted-Average
Fair Value
Balance at beginning of year
98,526

 
$
57.81

Granted
—

 
$
—

Vested
(1,968
)
 
$
49.56

Forfeited
(7,487
)
 
$
49.56

Balance at end of year
89,071

 
$
58.69
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Activity of Awarded Restricted Stock Units
The following table summarizes activity for our most recent fiscal year with respect to awarded RSUs:
 
Restricted Stock
Units
 
Weighted-Average
Grant Date
Fair Value
Balance at beginning of year
259,990

 
$
41.32

Granted
42,459

 
$
65.96

Vested
(79,828
)
 
$
38.90

Forfeited
(14,581
)
 
$
43.64

Balance at end of year
208,040

 
$
47.35