Table of Contents Index to Financial Statements The following table summarizes equity-classified performance unit activity to be paid out in Company stock for the years ended December 31, 2018, 2017 and 2016, and provides information for unvested units as of December 31, 2018, 2017 and 2016:  (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 144,927 units related to the reduction in workforce for the year ended December 31, 2018. (3) Includes 22,918 units and 37,590 units related to the reduction in workforce and executive management restructuring, respectively, for the year ended December 31, 2016. (4) Includes 87,595 units and 195,834 units related to the reduction in workforce and executive management restructuring, respectively, for the year ended December 31, 2016. 2018 2017 2016 Weighted Weighted Weighted Number of Average Fair Number of Average Fair Number of Average Fair Units  (1) Value Units  (1) Value Units  (1) Value (in thousands) (in thousands) (in thousands) Unvested shares at January 1 1,084  $ 10.12  719  $ 11.46  407  $ 36.65  Granted – $ – 1,197  $ 10.47  1,503  $ 8.60  Vested (290) $ 10.47  (325) $ 12.21  (889) (3) $ 12.78  Forfeited (196) (2) $ 9.94  (507) $ 9.53  (302) (4) $ 11.26  Unvested shares at December 31 598  $ 10.01  1,084  $ 10.12  719  $ 11.46  Liability-Classified Awards Liability-Classified Restricted Stock Units In the first quarter of 2018, the Company granted restricted stock units that vest over a period of four years and are payable in either cash or shares at the option of the Compensation Committee of the Company’s Board of Directors. The Company has accounted for these as liability-classified awards, and accordingly changes in the market value of the instruments will be recorded to general and administrative expense and capitalized expense over the vesting period of the award.  (in millions) 2018 Restricted stock units – general and administrative expense $ 4  Restricted stock units – general and administrative expense capitalized $ 3  The Company also recorded a deferred tax asset of $2 million related to liability-classified restricted stock units for the year ended December 31, 2018. As of December 31, 2018, there was $22 million of total unrecognized compensation cost related to liability-classified restricted stock units that is expected to be recognized over a weighted-average period of three years. The following table summarizes restricted stock unit activity to be paid out in cash for the year ended December 31, 2018 and provides information for unvested units as of December 31, 2018: (1) Includes 2,766,610 units related to the reduction in workforce for the year ended December 31, 2018. Number Weighted Average of Units Fair Value (in thousands) Unvested shares at January 1, 2018 – $ – Granted 12,216  $ 3.69  Vested (232) $ 5.14  Forfeited  (1) (3,782) $ 4.86  Unvested units at December 31, 2018 8,202  $ 3.41  117