SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

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 three months ended March 31, 2019 are summarized below:

	Three Months Ended March 31, 2019
	(unaudited)
	No. of Stock Units		Weighted Average Fair Value
	(in thousands)
Stock and stock units, beginning of period	856		$	18.79
Changes during the period:
Granted	—		$	—
Vested and settled	(16	)	$	24.25
Cancelled	(26	)	$	18.86
Stock and stock units, end of period	814		$	18.67

Summary of Transactions Involving Performance Awards

Transactions involving our performance awards during the three months ended March 31, 2019 are summarized below:

	Three Months Ended March 31, 2019
	(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	495		$	14.47	145		$	17.88
Changes during the period:
Granted	127		$	25.24	127		$	18.42
Vested and settled	(105	)	$	16.89	(35	)	$	25.40
Cancelled	(11	)	$	16.78	(12	)	$	23.66
Performance stock units, end of period	506		$	16.63	225		$	17.00

_________________

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 three months ended March 31, 2019 are summarized below:

	Three Months Ended March 31, 2019
	(unaudited)
	No. of Options	Weighted Average Exercise Price
	(in thousands)
Shares under option, beginning of period	52	$	32.56
Changes during the period:
Granted	—	$	—
Exercised	—	$	—
Cancelled	—	$	—
Expired	—	$	—
Shares under option, end of period	52	$	32.56
Exercisable at end of period	52	$	32.56