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Long-Term Incentive Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Equity-Classified Stock Option Activity
The following tables summarize stock option activity for the years 2020, 2019 and 2018, and provide information for options outstanding at December 31 of each year:
202020192018
Number
of Shares		Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
Number
of Shares
Weighted Average Exercise Price
(in thousands) (in thousands) (in thousands) 
Options outstanding at January 14,635 $15.26 5,178 $17.06 6,020 $19.43 
Granted— $— — $— — $— 
Exercised— $— — $— — $— 
Forfeited or expired(785)$24.46 (543)$32.38 (842)$33.99 
Options outstanding at December 313,850 $13.39 4,635 $15.26 5,178 $17.06 
Summary of Stock Options Outstanding and Options Exercisable
Options OutstandingOptions Exercisable
Range of
Exercise Prices
Options Outstanding at December 31, 2020Weighted Average Exercise PriceWeighted Average Remaining Contractual LifeOptions Exercisable at December 31, 2020Weighted Average Exercise PriceWeighted Average Remaining Contractual Life
(in thousands) (years)(in thousands) (years)
$7.74-$29.42
3,126 $8.95 2.33,126 $8.95 2.3
$30.59-$35.64
634 $30.59 0.9634 $30.59 0.9
$46.55-$46.55
90 $46.55 0.390 $46.55 0.3
3,850 $13.39 2.03,850 $13.39 2.0
Summary of Equity-Classified Restricted Stock Activity
The following table summarizes the restricted stock activity for the years 2020, 2019 and 2018, and provides information for restricted stock outstanding at December 31 of each year:
202020192018
Number of
Shares		Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
Number of
Shares
Weighted Average Fair Value
(in thousands) (in thousands) (in thousands) 
Unvested shares at January 11,480 $7.00 2,717 $7.91 6,254 $8.85 
Granted584 $2.86 493 $3.06 350 $4.72 
Vested(1,098)$5.26 (1,516)$7.16 (2,058)$9.24 
Forfeited(269)
(1)
$7.79 (214)
(2)
$8.38 (1,829)
(3)
$9.01 
Unvested shares at December 31697 $5.97 1,480 $7.00 2,717 $7.91 
(1)Includes 171,813 shares forfeited as a result of the reduction in workforce for the year end December 31, 2020.
(2)Includes 65,196 shares forfeited as a result of the reduction in workforce for the year ended December 31, 2019.
(3)Includes 1,287,636 shares forfeited as a result of the reduction in workforce for the year ended December 31, 2018.
The following table summarizes equity-classified restricted stock unit activity to be paid out in Company stock for the year ended December 31, 2020.
Number
of Units		Weighted Average
Fair Value
(in thousands)
Unvested Units at January 1, 2020— $— 
Granted186 $3.05 
Vested(42)$3.05 
Forfeited(10)$3.05 
Unvested Units at December 31, 2020134 $3.05 
Summary of Equity-Classified Performance Units Activity
The following table summarizes equity-classified performance unit activity to be paid out in Company stock for the years ended December 31, 2020, 2019 and 2018, and provides information for unvested units as of December 31, 2020, 2019 and 2018: 
202020192018
Number of
Units (1)
Weighted
Average Fair Value
Number of
Units (1)
Weighted
Average Fair Value
Number of
Units (1)
Weighted
Average Fair Value
(in thousands)(in thousands)(in thousands)
Unvested units at January 1178 $10.47 598 $10.01 1,084 $10.12 
Granted— $— — $— — $— 
Vested(178)$10.47 (378)$9.59 (290)$10.47 
Forfeited— $— (42)
(2)
$10.47 (196)
(3)
$9.94 
Unvested shares at December 31— $— 178 $10.47 598 $10.01 
(1)These amounts reflect the number of performance units granted in thousands.  The actual payout of shares may range from a minimum of zero shares to a maximum of two shares per unit contingent upon TSR.  The performance units have a three-year vesting term and the actual disbursement of shares, if any, is determined during the first quarter following the end of the three-year vesting period.
(2)Includes 41,761 units related to the reduction in workforce for the year ended December 31, 2019.
(3)Includes 144,927 units related to the reduction in workforce for the year ended December 31, 2018.
Summary of Liability-Classified Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity to be paid out in cash for the years ended December 31, 2020 and 2019 and provides information for unvested units as of December 31, 2020 and 2019:
202020192018
Number
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair ValueNumber
of Units		Weighted Average Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 112,992 $2.42 8,202 $3.41 — $— 
Granted6,172 $1.41 8,659 $4.34 12,216 $3.69 
Vested(3,960)$1.43 (2,624)$4.09 (232)$5.14 
Forfeited(3,591)
(1)
$2.67 (1,245)
(2)
$3.48 (3,782)
(3)
$4.86 
Unvested units at December 3111,613 $2.67 12,992 $2.42 8,202 $3.41 
(1)Includes 2,010,196 units related to the reduction in workforce for the year ended December 31, 2020.
(2)Includes 400,056 units related to the reduction in workforce for the year ended December 31, 2019.
(3)Includes 2,766,610 units related to the reduction in workforce for the year ended December 31, 2018.
Summary of Liability-Classified Performance Unit Activity
The following table summarizes liability-classified performance unit activity to be paid out in cash or stock for the years ended December 31, 2020, 2019 and 2018 and provides information for unvested units as of December 31, 2020, 2019 and 2018:
202020192018
Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value		Number
of Units		Weighted Average
Fair Value
(in thousands) (in thousands)(in thousands)
Unvested units at January 15,142 $2.42 2,803 $3.41 — $— 
Granted6,172 $1.41 2,757 $4.34 3,200 $3.70 
Vested— $— (43)$2.42 — $— 
Forfeited(2,615)
(1)
$3.05 (375)
(2)
$3.12 (397)
(3)
$4.55 
Unvested units at December 318,699 $2.57 5,142 $2.42 2,803 $3.41 
(1)Includes 518,450 units related to the reduction in workforce for the year ended December 31, 2020.
(2)Includes 375,086 units related to the reduction in workforce for the year ended December 31, 2019.
(3)Includes 295,160 units related to the reduction in workforce for the year ended December 31, 2018.
Share-based Compensation, Liability-based Restricted Cash Units Nonvested Activity
Number
of Units		Weighted Average
Fair Value
(in thousands)
Unvested units at January 1, 2020— $— 
Granted20,044 $1.00 
Vested(100)$1.00 
Forfeited(1,591)
(1)
$1.00 
Unvested Units at December 31, 202018,353 $1.00 
(1) Includes 945,500 units related to the reduction in workforce for the year ended December 31, 2020.
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Equity-Classified Stock-Based Compensation Costs
The Company recorded the following compensation costs related to stock options for the years ended December 31, 2020, 2019 and 2018:
(in millions)202020192018
Stock options – general and administrative expense$— $1 $2 
Stock options – general and administrative expense capitalized$— $— $— 
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Equity-Classified Stock-Based Compensation Costs
The Company recorded the following compensation costs related to restricted stock grants for the years ended December 31, 2020, 2019 and 2018:
(in millions)202020192018
Restricted stock grants – general and administrative expense$3 $6 $9 
Restricted stock grants – general and administrative expense capitalized$1 $4 $5 
Performance units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Equity-Classified Stock-Based Compensation Costs
(in millions)202020192018
Performance units – general and administrative expense$— $1 $3 
Performance units – general and administrative expense capitalized$— $— $1 
Liability-Classified RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Liability-Classified Stock-Based Compensation Costs
(in millions)202020192018
Restricted stock units – general and administrative expense$5 $7 $4 
Restricted stock units – general and administrative expense capitalized$2 $5 $3 
Liability-Classified Performance Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Liability-Classified Stock-Based Compensation Costs
(in millions)202020192018
Liability-classified performance units – general and administrative expense$7 $2 $2 
Liability-classified performance units – general and administrative expense capitalized$2 $1 $—