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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
STOCK COMPENSATION  
Schedule of Share Based Compensation Expense [Table Text Block]
We recognized the following compensation expense for stock-based awards for the years ended December 31, 2019, 2018 and 2017 in our consolidated statements of operations:
 
2019
 
2018
 
2017
 
(in millions)
General and administrative expenses
$
25

 
$
36

 
$
23

Production costs
7

 
9

 
6

Total stock-based compensation expense
$
32

 
$
45

 
$
29
Summary of changes in cash and stock-settled Restricted Stock Units (RSUs)
The following summarizes our restricted stock activity for the year ended December 31, 2019:
 
Stock-Settled
 
Cash-Settled
 
Number of Units
(in thousands)
 
Weighted-Average Grant-Date Fair Value
 
Number of Units
(in thousands)
Unvested at January 1
819

 
$
17.36

 
2,636

Granted(a)
171

 
$
21.71

 
1,511

Vested
(409
)
 
$
19.20

 
(1,391
)
Forfeited
(27
)

$
13.48

 
(471
)
Unvested at December 31
554

 
$
17.54

 
2,285
Summary of changes in cash and stock-settled Performance Stock Units (PSUs)
The following summarizes our PSU activity for the year ended December 31, 2019:
 
Stock-Settled
 
Cash-Settled
 
Number of Awards
(in thousands)
 
Weighted-Average Grant-Date Fair Value
 
Number of Units
(in thousands)
Unvested at January 1
294

 
$
18.34

 
196

Granted
214

 
$
21.71

 
214

Vested
—

 
$
—

 
—

Forfeited
(11
)
 
$
20.19

 
(9
)
Unvested at December 31
497

 
$
19.75

 
401
Stock Options  
STOCK COMPENSATION  
Schedule of grant date assumptions used in the Black-Scholes valuation for stock options
The grant date assumptions used in the Black-Scholes valuation for options granted during 2019, 2018, 2015 and 2014 were as follows:
 
2019
 
2018
 
2015
 
2014
Exercise price per share
$
23.88

 
$
20.17

 
$
42.00

 
$
81.10

Expected life (in years)
4.5

 
4.5

 
4.5

 
4.5

Expected volatility
78.26
%
 
69.85
%
 
44.7
%
 
35.4
%
Risk-free interest rate
2.47
%
 
2.63
%
 
1.56
%
 
1.40
%
Dividend yield
—
%
 
—
%
 
0.95
%
 
0.50
%
Grant-date fair value of stock option awards
$
12.95

 
$
10.02

 
$
15.00

 
$
19.80
Summary of stock option activity
The following table summarizes our option activity during the year ended December 31, 2019:
 
Options
(in thousands)
 
Weighted-Average Exercise Price
 
Weighted-Average Grant-Date Fair Value
 
Aggregate Intrinsic Value
Beginning balance, January 1
1,287

 
$
62.82

 
$
17.22

 
$
—

Granted
144

 
$
23.88

 
$
12.95

 
$
—

Exercised
(1
)
 
$
20.17

 
$
10.02

 
$
—

Expired or Canceled
(3
)
 
$
22.28

 
$
11.69

 
$
—

Ending balance, December 31
1,427

 
$
59.00

 
$
16.81

 
$
—

Exercisable at December 31
1,174

 
$
66.91

 
$
17.92

 
$
—