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Shareholders' Equity and Stock Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Shareholders' Equity and Stock Incentive Plans [Abstract]  
Schedule of Restricted Stock Awards and Restricted Stock Units Activity
The table below summarizes restricted stock award and unit activity for the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
 
 
Restricted Stock Awards and Units
 
Weighted Average Grant Date
Fair Value
 
Restricted Stock Awards and Units
 
Weighted Average Grant Date
Fair Value
Unvested, beginning of period
 
2,266,667

 

$19.28

 
1,482,655

 

$28.07

Granted
 
1,918,683

 

$11.01

 
1,347,165

 

$14.68

Vested
 
(851,456
)
 

$20.64

 
(564,912
)
 

$31.87

Forfeited
 
(13,834
)
 

$17.16

 
(1,078
)
 

$29.61

Unvested, end of period
 
3,320,060

 

$14.16

 
2,263,830

 

$19.15
Schedule of Stock Appreciation Rights Award Activity
The table below summarizes the activity for stock appreciation rights that will be settled in cash (“Cash SARs”) for the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
 
 
Cash SARs
 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
 
Cash SARs
 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
Outstanding, beginning of period
 
1,330,924

 

$21.35

 

 
714,238

 

$27.12

 
 
Granted
 
770,775

 

$10.98

 

 
616,686

 

$14.67

 
 
Exercised
 
—

 

$—

 
 
 
—

 

$—

 
 
Forfeited
 
—

 

$—

 
 
 
—

 

$—

 
 
Expired
 
—

 

$—

 
 
 
—

 

$—

 
 
Outstanding, end of period
 
2,101,699

 

$17.55

 
5.1
 
1,330,924

 

$21.35

 
5.1
Vested, end of period
 
919,800

 

$24.34

 
 
 
543,018

 

$27.18

 
 
Vested and exercisable, end of period
 
—

 

$24.34

 
3.2
 
—

 

$27.18

 
3.3
Schedule of Stock Appreciation Rights Valuation Assumptions
The following table summarizes the assumptions used and the resulting grant date fair value of the Cash SARs granted during the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
Expected term (in years)
 
6.1

 
6.0

Expected volatility
 
56.0
%
 
54.3
%
Risk-free interest rate
 
2.6
%
 
2.8
%
Dividend yield
 
—
%
 
—
%
Grant date fair value per Cash SAR
 
$6.00
 
$7.89
Schedule of Performance Shares Award Unvested Activity
The table below summarizes performance share activity for the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
 
 
Target Performance Shares (1)
 
Weighted Average Grant Date
Fair Value
 
Target Performance Shares (1)
 
Weighted Average Grant Date
Fair Value
Unvested, beginning of period
 
182,209

 

$27.01

 
144,955

 

$47.14

Granted
 
130,302

 

$14.20

 
93,771

 

$19.09

Vested at end of performance period
 
(31,244
)
 

$35.71

 
(49,458
)
 

$65.51

Did not vest at end of performance period
 
(10,407
)
 

$35.71

 
(7,059
)
 

$65.51

Forfeited
 
—

 

$—

 
—

 

$—

Unvested, end of period
 
270,860

 

$19.51

 
182,209

 

$27.01
Results of Total Shareholder Return Ranking
The following table presents the results of the Company’s final TSR ranking during the performance periods that ended during the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
Target performance shares granted
 
41,651
 
56,517
Multiplier
 
75
%
 
88
%
Performance shares vested
 
31,244
 
49,458
Performance shares that did not vest
 
10,407
 
7,059
Aggregate fair value of performance shares vested (In thousands)
 
$357
 
$768
Schedule of Performance Share Award Valuation Assumptions
following table summarizes the assumptions used and the resulting grant date fair value per performance share for the performance shares granted during the three months ended March 31, 2019:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
Number of simulations
 
500,000
 
500,000
Expected term (in years)
 
3.1

 
3.0

Expected volatility
 
58.2
%
 
61.5
%
Risk-free interest rate
 
2.5
%
 
2.4
%
Dividend yield
 
—
%
 
—
%
Grant date fair value per performance share
 
$14.20
 
$19.09
Schedule of Stock-based Compensation, net
The Company recognized the following stock-based compensation expense, net for the three months ended March 31, 2019 and 2018:
 
 
 Three Months Ended March 31,
 
 
2019
 
2018
 
 
(In thousands)
Restricted stock awards and units
 

$4,823

 

$5,084

Cash SARs
 
760

 
(1,415
)
Performance shares
 
435

 
557

 
 
6,018

 
4,226

Less: amounts capitalized to oil and gas properties
 
(1,903
)
 
(708
)
Total stock-based compensation expense, net
 

$4,115

 

$3,518