SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2016

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 twelve months ended December 31, 2016, the seven months ended December 31, 2016 and the years ended May 31, 2015, and 2014 are summarized below:

	Twelve Months Ended December 31, 2016				Seven Months Ended December 31, 2015
	No. of Stock Units		Weighted  Average Fair Value		No. of Stock Units		Weighted  Average Fair Value
	(in thousands)				(in thousands)
Stock and stock units, beginning of year	371		$	36.26	304		$	36.23
Changes during the year:
Granted	322		$	34.23	197		$	35.14
Assumed - Furmanite Acquisition	40		$	25.63	—		$	—
Vested and settled	(180	)	$	34.19	(126	)	$	34.43
Cancelled	(18	)	$	30.75	(4	)	$	39.27
Stock and stock units, end of year	535		$	35.11	371		$	36.26

	Year Ended May 31, 2015				Year Ended May 31, 2014
	No. of Stock Units		Weighted  Average Fair Value		No. of Stock Units		Weighted  Average Fair Value
	(in thousands)				(in thousands)
Stock and stock units, beginning of year	310		$	31.42	329		$	26.07
Changes during the year:
Granted	156		$	39.51	136		$	36.70
Vested and settled	(133	)	$	29.23	(139	)	$	24.32
Cancelled	(29	)	$	34.12	(16	)	$	28.01
Stock and stock units, end of year	304		$	36.23	310		$	31.42

Summary of Transactions Involving Performance Awards

Transactions involving our performance awards during the year ended December 31, 2016, the seven months ended December 31, 2015, and the year ended May 31, 2015 are summarized below:

	Twelve Months Ended December 31, 2016			Seven Months Ended December 31, 2015
	No. of Long- Term Performance Stock Units	Weighted Average Fair Value		No. of Long- Term Performance Stock Units	Weighted Average Fair Value
	(in thousands)			(in thousands)
Long-term performance stock units, beginning of year	59	$	37.16	23	$	42.25
Changes during the year:
Granted	—	$	—	36	$	33.91
Vested and settled	—	$	—	—	$	—
Cancelled	—	$	—	—	$	—
Long-term performance stock units, end of year	59	$	37.16	59	$	37.16

	Year Ended May 31, 2015
	No. of Long- Term Performance Stock Units	Weighted Average Fair Value
	(in thousands)
Long-term performance stock units, beginning of year	—	$	—
Changes during the year:
Granted	23	$	42.25
Vested and settled	—	$	—
Cancelled	—	$	—
Long-term performance stock units, end of year	23	$	42.25

Transactions involving our performance awards during the twelve months ended December 31, 2016, the seven months ended December 31, 2016, and the years ended May 31, 2015, and 2014 are summarized below:

	Twelve Months Ended December 31, 2016				Seven Months Ended December 31, 2015
	No. of Performance Awards		Weighted Average Fair Value		No. of Performance Awards		Weighted Average Fair Value
	(in thousands)				(in thousands)
Performance awards, beginning of year	13		$	35.15	28		$	32.86
Changes during the year:
Granted	—		$	—	—		$	—
Vested and settled	(13	)	$	35.15	(15	)	$	30.82
Cancelled	—		$	—	—		$	—
Performance awards, end of year	—		$	—	13		$	35.15

	Year Ended May 31, 2015				Year Ended May 31, 2014
	No. of Performance Awards		Weighted Average Fair Value		No. of Performance Awards		Weighted Average Fair Value
	(in thousands)				(in thousands)
Performance awards, beginning of year	50		$	30.63	57		$	25.47
Changes during the year:
Granted	—		$	—	17		$	36.40
Vested and settled	(22	)	$	27.66	(24	)	$	22.65
Cancelled	—		$	—	—		$	—
Performance awards, end of year	28		$	32.86	50		$	30.63

Summary of Transactions Involving Stock Options

Transactions involving our stock options during the twelve months ended December 31, 2016, the seven months ended December 31, 2015, and the years ended May 31, 2015, and 2014 are summarized below:

	Twelve Months Ended December 31, 2016				Seven Months Ended December 31, 2015
	No. of Options		Weighted Average Exercise Price		No. of Options		Weighted Average Exercise Price
	(in thousands)				(in thousands)
Shares under option, beginning of year	376		$	25.71	490		$	24.80
Changes during the year:
Granted	—		$	—	—		$	—
Assumed - Furmanite Acquisition	132		$	33.20	—		$	—
Exercised	(251	)	$	23.50	(109	)	$	21.41
Cancelled	(50	)	$	35.00	—		$	—
Expired	(4	)	$	44.62	(5	)	$	30.33
Shares under option, end of year	203		$	30.63	376		$	25.71
Exercisable at end of year	203		$	30.63	376		$	25.71

	Year Ended May 31, 2015				Year Ended May 31, 2014
	No. of Options		Weighted Average Exercise Price		No. of Options		Weighted Average Exercise Price
	(in thousands)				(in thousands)
Shares under option, beginning of year	816		$	19.61	1,052		$	20.24
Changes during the year:
Granted	—		$	—	—		$	—
Exercised	(326	)	$	11.79	(232	)	$	22.69
Cancelled	—		$	—	—		$	—
Expired	—		$	—	(4	)	$	6.96
Shares under option, end of year	490		$	24.80	816		$	19.61
Exercisable at end of year	490		$	24.80	816		$	19.61

Total Options Outstanding, Range of Exercise Prices and Remaining Contractual Lives

Options exercisable at December 31, 2016 had a weighted-average remaining contractual life of 2.7 years. For total options outstanding at December 31, 2016, the range of exercise prices and remaining contractual lives are as follows:

Range of Prices	No. of Options	Weighted Average Exercise Price		Weighted Average Remaining Life
	(in thousands)			(in years)
$20.19 to $30.28	44	$	25.80	1.9
$30.28 to $40.38	152	$	31.08	2.7
$40.38 to $50.47	7	$	50.47	7.4
	203	$	30.63	2.7