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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Share Activity
The following table sets forth market based performance share unit transactions for the year ended December 31, 2019:
 
Performance Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
Nonvested - December 31, 2018
284,415

 
$
8.99

Granted
845,680

 
4.17

Vested
—

 
—

Forfeited
(169,040
)
 
6.49

Nonvested - December 31, 2019
961,055

 
$
5.18

The following table sets forth cash-settled restricted stock unit transactions for the year ended December 31, 2019:
 
Cash-Settled Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
Nonvested - December 31, 2018
78,224

 
$
6.63

Granted
409,390

 
3.12

Vested
(28,123
)
 
6.63

Forfeited
(46,570
)
 
3.75

Nonvested - December 31, 2019
412,921

 
$
3.47

The following table sets forth the restricted stock transactions for the year ended December 31, 2019:
 
Restricted Stock
 
Weighted-Average Grant Date Fair Value
Nonvested - December 31, 2018
246,653

 
$
6.24

Granted
428,984

 
3.12

Vested
(246,653
)
 
6.24

Forfeited
—

 
—

Nonvested - December 31, 2019
428,984

 
$
3.12

The following table sets forth stock-settled time-based restricted stock unit transactions for the year ended December 31, 2019:
 
Restricted Stock Units
 
Weighted-Average Grant Date Fair Value
Nonvested - December 31, 2018
713,558

 
$
8.13

Granted
1,194,624

 
3.28

Vested
(335,308
)
 
8.41

Forfeited
(212,804
)
 
5.05

Nonvested - December 31, 2019
1,360,070

 
$
4.28
Schedule of Assumptions Used to Value the Market Based Performance Awards
The following weighted-average assumptions were used to value the market based performance awards:
 
Year Ended December 31,
 
2019
 
2018
Expected volatility
68.9
%
 
89.5
%
Risk-free interest rate
2.2
%
 
2.4
%
Dividend yield
—
%
 
—
%
Expected life (years)
2.49

 
2.77