SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 are summarized below: 

	Twelve Months Ended December 31, 2020
	No. of Stock Units	Weighted  Average Fair Value
	(in thousands)
Stock and stock units, beginning of year	784	$	17.35
Changes during the year:
Granted	480	$	8.56
Vested and settled	(323)	$	17.02
Cancelled	(87)	$	17.16
Stock and stock units, end of year	854	$	12.55

Summary of Transactions Involving Performance Awards

Transactions involving our performance awards during the twelve months ended December 31, 2020 are summarized below:

	Twelve Months Ended December 31, 2020
	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	489	$	16.49	209	$	17.06
Changes during the period:
Granted	162	$	7.99	162	$	8.56
Vested and settled	(89)	$	17.54	(65)	$	15.24
Cancelled	(8)	$	25.24	(32)	$	16.05
Performance stock units, end of period	554	$	13.69	274	$	12.55

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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, 2020 are summarized below: 

	Twelve Months Ended December 31, 2020
	No. of Options	Weighted Average Exercise Price
	(in thousands)
Shares under option, beginning of year	52	$	32.56
Changes during the year:
Exercised	—	$	—
Cancelled	(12)	$	31.82
Expired	(21)	$	29.16
Shares under option, end of year	19	$	36.90
Exercisable at end of year	19	$	36.90