SHARE-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 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 during the nine months ended September 30, 2018 are summarized below:

	Nine Months Ended September 30, 2018
	(unaudited)
	No. of Stock Units		Weighted Average Fair Value
	(in thousands)
Stock and stock units, beginning of period	854		$	21.42
Changes during the period:
Granted	40		$	19.85
Vested and settled	(71	)	$	21.13
Cancelled	(51	)	$	21.89
Stock and stock units, end of period	772		$	21.26

Summary of Transactions Involving Performance Awards

Transactions involving our performance awards during the nine months ended September 30, 2018 are summarized below:

	Nine Months Ended September 30, 2018
	(unaudited)
	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	(20	)	$	22.19
Performance stock units, end of period	495		$	14.47	164		$	19.78

_________________

1 Performance units with variable payouts are shown at target level of performance.

Summary of Transactions Involving Stock Options

Transactions involving our stock options during the nine months ended September 30, 2018 are summarized below:

	Nine Months Ended September 30, 2018
	(unaudited)
	No. of Options		Weighted Average Exercise Price
	(in thousands)
Shares under option, beginning of period	79		$	31.94
Changes during the period:
Granted	—		$	—
Exercised	—		$	—
Cancelled	—		$	—
Expired	(15	)	$	32.88
Shares under option, end of period	64		$	31.72
Exercisable at end of period	64		$	31.72