SHARE-BASED COMPENSATION: (Tables)

3 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of option activity

Stock option activity for the three months endedJune 30, 2018 was: 

					Weighted-average
			Weighted-average		remaining	Aggregate
	Number of		exercise price		contractual term	Intrinsic value
	shares		per share		(in years)	(in thousands)
Outstanding at March 31, 2018	2,565,287		$	13.61
Exercised	(125,437	)	$	8.80		$	2,426
Forfeited or canceled	(25,831	)	$	14.25
Outstanding at June 30, 2018	2,414,019		$	13.86	5.1	$	38,910
Exercisable at June 30, 2018	2,169,170		$	14.58	4.8	$	33,397

Summary of stock options outstanding and exercisable

A summary of stock options outstanding and exercisable as of June 30, 2018 was:

					Options outstanding				Options exercisable
Range of						Weighted-average	Weighted-average			Weighted-average
exercise price					Options	remaining	exercise price		Options	exercise price
per share					outstanding	contractual life	per share		exercisable	per share
$	0.61	—	$	9.99	545,583	5.2 years	$	1.62	390,000	$	1.71
$	10.00	—	$	19.99	1,176,361	4.4 years	$	14.95	1,092,595	$	14.74
$	20.00	—	$	24.99	672,523	6.2 years	$	21.30	667,023	$	21.30
$	25.00	—	$	32.85	19,552	5.4 years	$	32.85	19,552	$	32.85
					2,414,019	5.1 years	$	13.86	2,169,170	$	14.58

Schedule of performance stock option unit activity

Performance stock option unit activity for the three months endedJune 30, 2018 was:

					Weighted-average
			Weighted-average		remaining	Aggregate
	Number		exercise price		contractual term	intrinsic value
	of shares		per share		(in years)	(in thousands)
Outstanding at March 31, 2018	329,404		$	21.42
Forfeited or canceled	(186,538	)	$	21.41
Outstanding at June 30, 2018	142,866		$	21.43	1.9	$	1,217
Exercisable at June 30, 2018	—		$	—	—	$	—

Schedule of non-vested time-vesting restricted stock unit activity

me-vesting restricted stock unit activity for the three months endedJune 30, 2018 was:

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2018	3,449,001		$	24.35	2.32
Granted	1,703,482		$	27.34
Vested	(692,206	)	$	23.14
Forfeited or canceled	(227,978	)	$	24.98
Outstanding at June 30, 2018	4,232,299		$	25.72	2.82

Schedule of non-vested performance-based restricted stock units activity

Non-vested performance-based restricted stock unit activity for the three months endedJune 30, 2018 was:

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2018	682,763		$	25.23	1.54
Granted	216,727		$	31.07
Vested	(20,965	)	$	19.07
Forfeited or canceled	(129,123	)	$	24.13
Outstanding at June 30, 2018	749,402		$	27.28	1.78

Schedule of other performance unit activity

Other performance-based stock unit activity for the three months endedJune 30, 2018 was: 

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2018	111,111		$	5.33	-
Vested	(45,364	)	$	5.33
Forfeited or canceled	(65,747	)	$	5.33
Outstanding at June 30, 2018	—		$	—	-