SHARE-BASED COMPENSATION: (Tables)

3 Months Ended

Jun. 30, 2015

SHARE-BASED COMPENSATION:

Schedule of option activity

	Number of shares		Weighted-average exercise price per share		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at March 31, 2015	4,870,219		$	15.11
Granted	426,380		$	17.73
Exercised	(114,534	)	$	5.92		$	1,337
Forfeited or cancelled	(266,442	)	$	28.68
Outstanding at June 30, 2015	4,915,623		$	14.81	4.92	$	23,091
Exercisable at June 30, 2015	3,239,911		$	16.66	3.28	$	10,911

Summary of stock options outstanding and exercisable

	Options outstanding				Options exercisable
Range of exercise price per share	Options outstanding	Weighted-average remaining contractual life	Weighted-average exercise price per share		Options exercisable	Weighted-average exercise price per share
$    0.63 - $   8.90	1,012,561	7.27 years	$	1.68	308,431	$	2.14
$  11.08 - $ 14.42	1,404,362	4.33 years	$	13.17	1,204,803	$	13.12
$  15.10 - $ 19.76	988,969	5.45 years	$	16.94	549,649	$	16.27
$  20.44 - $ 25.00	1,363,721	3.78 years	$	22.27	1,045,683	$	22.57
$  26.33 - $ 35.16	69,850	2.43 years	$	32.42	55,185	$	32.30
$  41.38 - $ 62.06	76,160	0.32 years	$	41.97	76,160	$	41.97
	4,915,623	4.92 years	$	14.81	3,239,911	$	16.66

Summary of SAR activity

	Number of shares	Weighted-average exercise price per share		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at March 31, 2015	245,404	$	40.00
Outstanding at June 30, 2015	245,404	$	40.00	1.75	$	—
Exercisable at June 30, 2015	—	$	—	—	$	—

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

	Number of shares		Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	2,052,865		$	20.53	1.95
Granted	634,145		$	17.58
Vested	(310,781	)	$	18.02
Forfeited or cancelled	(65,787	)	$	19.91
Outstanding at June 30, 2015	2,310,442		$	20.07	2.27

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

	Number of shares		Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	389,310		$	21.12	1.57
Granted	327,187		$	18.12
Forfeited or cancelled	(41,814	)	$	20.97
Outstanding at June 30, 2015	674,683		$	19.67	2.02

Summary of other performance unit activity

	Number of shares	Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	312,575	$	5.23
Outstanding at June 30, 2015	312,575	$	5.23	2.11