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Shareholders' Equity and Stock Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2018
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 six months ended June 30, 2018:
 
 
Restricted Stock Awards and Units
 
Weighted Average Grant Date
Fair Value
Unvested restricted stock awards and units, beginning of period
 
1,482,655

 

$28.07

Granted
 
1,348,415

 

$14.68

Vested
 
(608,904
)
 

$31.43

Forfeited
 
(10,993
)
 

$19.17

Unvested restricted stock awards and units, end of period
 
2,211,173

 

$19.02
Schedule of Stock Appreciation Rights Award Activity
The table below summarizes the activity for SARs for the six months ended June 30, 2018:
 
 
SARs
 
Weighted
Average
Exercise
Prices
 
Weighted Average Remaining Life
(In years)
 
Aggregate Intrinsic Value
(In millions)
 
Aggregate Intrinsic Value of Exercises
(In millions)
Outstanding, beginning of period
 
714,238

 

$27.12

 

 
 
 
 
Granted
 
616,686

 

$14.67

 

 
 
 
 
Exercised
 
—

 

$—

 
 
 
 
 

$—

Forfeited
 
—

 

$—

 
 
 
 
 
 
Expired
 
—

 

$—

 
 
 
 
 
 
Outstanding, end of period
 
1,330,924

 

$21.35

 
4.8
 

$9.1

 
 
Vested, end of period
 
543,018

 

$27.18

 
 
 
 
 
 
Vested and exercisable, end of period
 
543,018

 

$27.18

 
3.04
 

$0.5

 
 
Schedule of Stock Appreciation Rights Valuation Assumptions
The following table summarizes the assumptions used to calculate the grant date fair value of the Incentive Cash SARs granted during the six months ended June 30, 2018:
 
 
Grant Date Fair Value Assumptions
Expected term (in years)
 
6.0

Expected volatility
 
54.3
%
Risk-free interest rate
 
2.8
%
Dividend yield
 
—
%
Schedule of Performance Shares Award Unvested Activity
The table below summarizes performance share activity for the six months ended June 30, 2018:
 
 
Target Performance Shares (1)
 
Weighted Average Grant Date
Fair Value
Unvested performance shares, beginning of period
 
144,955

 

$47.14

Granted
 
93,771

 

$19.09

Vested at end of performance period
 
(49,458
)
 

$65.51

Did not vest at end of performance period
 
(7,059
)
 

$65.51

Forfeited
 
—

 

$—

Unvested performance shares, end of period
 
182,209

 

$27.01
Schedule of Performance Share Award Valuation Assumptions
following table summarizes the assumptions used to calculate the grant date fair value of the performance shares granted during the six months ended June 30, 2018:
 
 
Grant Date Fair Value Assumptions
Number of simulations
 
500,000
Expected term (in years)
 
3.0

Expected volatility
 
61.5
%
Risk-free interest rate
 
2.4
%
Dividend yield
 
—
%
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, 2018 and 2017:
 
 
 Three Months Ended
June 30,
 
 Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(In thousands)
Restricted stock awards and units
 

$4,720

 

$5,024

 

$9,804

 

$10,873

SARs
 
5,788

 
(3,783
)
 
4,373

 
(7,469
)
Performance shares
 
406

 
574

 
963

 
1,280

 
 
10,914

 
1,815

 
15,140

 
4,684

Less: amounts capitalized to oil and gas properties
 
(3,708
)
 
(233
)
 
(4,416
)
 
(1,088
)
Total stock-based compensation expense, net
 

$7,206

 

$1,582

 

$10,724

 

$3,596