SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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, 2018 are summarized below:

	Twelve Months Ended December 31, 2018
	No. of Stock Units		Weighted  Average Fair Value
	(in thousands)
Stock and stock units, beginning of year	854		$	21.42
Changes during the year:
Granted	370		$	18.09
Vested and settled	(291	)	$	24.76
Cancelled	(77	)	$	21.37
Stock and stock units, end of year	856		$	18.79

Summary of Transactions Involving Performance Awards

Transactions involving our performance awards during the twelve months ended December 31, 2018 are summarized below:

	Twelve Months Ended December 31, 2018
	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	45		$	17.66	84		$	25.76
Changes during the period:
Granted	465		$	14.24	115		$	15.00
Vested and settled	—		$	—	(15	)	$	13.45
Cancelled	(15	)	$	16.78	(39	)	$	27.95
Performance stock units, end of period	495		$	14.47	145		$	17.88

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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, 2018 are summarized below:

	Twelve Months Ended December 31, 2018
	No. of Options		Weighted Average Exercise Price
	(in thousands)
Shares under option, beginning of year	79		$	31.94
Changes during the year:
Granted	—		$	—
Exercised	—		$	—
Cancelled	—		$	—
Expired	(27	)	$	30.75
Shares under option, end of year	52		$	32.56
Exercisable at end of year	52		$	32.56