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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Transactions Involving Stock Units and Director Stock Grants
Transactions involving our stock units and director stock grants for the twelve months ended December 31, 2019 are summarized below: 
 
Twelve Months Ended
December 31, 2019
 
No. of Stock
Units
 
Weighted 
Average
Fair Value
 
(in thousands)
 
 
Stock and stock units, beginning of year
856

 
$
18.79

Changes during the year:
 
 
 
Granted
374

 
$
16.57

Vested and settled
(378
)
 
$
19.59

Cancelled
(68
)
 
$
18.64

Stock and stock units, end of year
784

 
$
17.35
Summary of Transactions Involving Performance Awards
Transactions involving our performance awards during the twelve months ended December 31, 2019 are summarized below:
 
Twelve Months Ended
December 31, 2019
 
Performance Units Subject to Market Conditions
 
Performance Units Not Subject to Market Conditions
 
No. of Stock
Units1
 
Weighted
Average
Fair Value
 
No. of Stock
Units1
 
Weighted
Average
Fair Value
 
(in thousands)
 
 
 
(in thousands)
 
 
Performance stock units, beginning of period
495

 
$
14.47

 
145

 
$
17.88

Changes during the period:
 
 
 
 
 
 
 
Granted
127

 
$
25.24

 
127

 
$
18.42

Vested and settled
(70
)
 
$
16.51

 
—

 
$
—

Cancelled
(63
)
 
$
18.29

 
(63
)
 
$
21.68

Performance stock units, end of period
489

 
$
16.49

 
209

 
$
17.06

__________________________
1
Performance units with variable payouts are shown at target level of performance.
Summary of Transactions Involving Stock Options
Transactions involving our stock options for the twelve months ended December 31, 2019 are summarized below: 
 
Twelve Months Ended
December 31, 2019
 
No. of
Options
 
Weighted
Average
Exercise Price
 
(in thousands)
 
 
Shares under option, beginning of year
52

 
$
32.56

Shares under option, end of year
52

 
$
32.56

Exercisable at end of year
52

 
$
32.56