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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Expense
The following table presents share-based compensation expense for each respective period:
໿

For the Year Ended December 31,

2017
 
2016
 
2015
Share-based compensation cost for:
Equity-based
 
Liability-based
 
Equity-based
 
Liability-based
 
Equity-based
 
Liability-based
RSU equity awards (a)
$
10,225

 
$
—

 
$
4,536

 
$
—

 
$
3,797

 
$
—

Cash-settleable RSU awards (a)
—

 
4,294

 
—

 
12,285

 
—

 
11,437

401(k) CPE stock fund contributions
313

 
—

 
277

 
—

 
266

 
—

Total share-based compensation cost (b)
$
10,538

 
$
4,294

 
$
4,813

 
$
12,285

 
$
4,063

 
$
11,437


(a)
Includes the settlement of the outstanding share-based award agreements of the Company’s former Chief Executive Officer, resulting in $6,351 recorded on the Consolidated Statements of Operations as Settled share-based awards for the year ended December 31, 2017.
(b)
The portion of this share-based compensation cost that was included in general and administrative expense totaled $5,194, $9,722 and $9,299 for the years ended December 31, 2017, 2016 and 2015, respectively, and the portion capitalized to oil and gas properties was $3,287, $7,376 and $6,201, for the years ended December 31, 2017, 2016, and 2015, respectively.
Schedule of Unrecognized Compensation Cost
The following table presents the unrecognized compensation cost for the indicated periods:

 
December 31,
Unrecognized compensation cost related to:
 
2017
 
2016
 
2015
Unvested RSU equity awards
 
$
13,158

 
$
7,276

 
$
5,208

Unvested cash-settleable RSU awards
 
3,776

 
8,948

 
4,728
Summary of Liability for Cash-Settled RSU Awards
The following table summarizes the Company’s liability for cash-settled RSU awards for the periods indicated:

 
December 31,
Consolidated Balance Sheets Classification
 
2017
 
2016
Cash-settled RSU awards (current)
 
$
4,621

 
$
8,919

Cash-settled RSU awards (non-current)
 
3,490

 
8,071

Total cash-settled RSU awards
 
$
8,111

 
$
16,990
Schedule of Unvested Restricted Stock Units Activity
The following table represents unvested restricted stock activity for the year ended December 31, 2017:

 
 
 
Weighted average
(shares in 000s)
 
Number of Shares
 
Grant-Date Fair Value per Share
 
Years Over Which Expense is Expected to be Recognized
Outstanding at the beginning of the period
 
1,448

 
$
10.81

 
 
Granted (a)(b)
 
1,173

 
12.25

 
 
Vested (b)(c)
 
(797
)
 
11.35

 
 
Forfeited
 
(34
)
 
9.57

 
 
Outstanding at the end of the period
 
1,790

 
$
11.54

 
1.94

(a)
Includes 89 market-based RSUs that will vest at a range of 0% - 200%. See Note 8 for additional information about market-based RSU equity awards.
(b)
Includes 73 market-based RSUs that were granted and subsequently vested at 142% of their issued units in 2017.
(c)
The fair value of shares vested was $9,045.
Schedule of Cash-Settleable RSUs Outstanding
As of December 31, 2017, the Company had the following cash-settleable RSUs outstanding (including those that are not based on a market condition):
(shares in 000s)
 
Base Units Outstanding
 
Potential Minimum Units Vesting
 
Potential Maximum Units Vesting
Vesting in 2018
 
165

 
13

 
316

Vesting in 2019
 
200

 
17

 
384

Vesting in 2020
 
—

 
—

 
—

Other
 
203

 
203

 
203

Total cash-settleable RSUs
 
568

 
233

 
903