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Shareholders' Equity and Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2019 and 2018:
 
 
 Three Months Ended June 30,
 
 
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
 
3,320,060

 

$14.16

 
2,263,830

 

$19.15

Granted
 
115,936

 

$11.90

 
1,250

 

$15.43

Vested
 
(52,639
)
 

$25.20

 
(43,992
)
 

$25.76

Forfeited
 
(47,464
)
 

$12.05

 
(9,915
)
 

$18.04

Unvested, end of period
 
3,335,893

 

$13.94

 
2,211,173

 

$19.02


 
 
Six Months Ended June 30,
 
 
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
 
2,034,619

 

$11.06

 
1,348,415

 

$14.68

Vested
 
(904,973
)
 

$20.91

 
(608,904
)
 

$31.43

Forfeited
 
(60,420
)
 

$13.14

 
(10,993
)
 

$19.17

Unvested, end of period
 
3,335,893

 

$13.94

 
2,211,173

 

$19.02
Schedule of Stock Appreciation Rights Award Activity The table below summarizes the activity for Cash SARs for the six months ended June 30, 2019 and 2018:
 
 
Six Months Ended June 30,
 
 
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

 
4.9
 
1,330,924

 

$21.35

 
4.8
Vested, end of period
 
919,800

 

$24.34

 
 
 
543,018

 

$27.18

 
 
Vested and exercisable, end of period
 
—

 

$24.34

 
3.0
 
543,018

 

$27.18

 
3.0
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 six months ended June 30, 2019 and 2018:
 
 
Six Months Ended June 30,
 
 
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 six months ended June 30, 2019 and 2018:
 
 
Six Months Ended June 30,
 
 
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 six months ended June 30, 2019 and 2018:
 
 
Six Months Ended June 30,
 
 
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 millions)
 
$0.4
 
$0.8
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 grant activity during the six months ended June 30, 2019:
 
 
Six Months Ended June 30,
 
 
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 and six months ended June 30, 2019 and 2018:
 
 
 Three Months Ended June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
(In thousands)
Restricted stock awards and units
 

$5,358

 

$4,720

 

$10,181

 

$9,804

Cash SARs
 
(426
)
 
5,788

 
334

 
4,373

Performance shares
 
436

 
406

 
871

 
963

 
 
5,368

 
10,914

 
11,386

 
15,140

Less: amounts capitalized to oil and gas properties
 
(1,514
)
 
(3,708
)
 
(3,417
)
 
(4,416
)
Total stock-based compensation expense, net
 

$3,854

 

$7,206

 

$7,969

 

$10,724