STOCK-BASED COMPENSATION Stock Option Activity (Details) - Stock Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at March 31, 2016	1,461
Options granted	136
Options exercised	(27)
Options forfeited or expired	0
Outstanding at June 30, 2016	1,570
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price of options outstanding, March 31, 2016	$ 41.24
Weighted average exercise price of options granted	42.42
Weighted average exercise price of options exercised	27.25
Weighted average exercise price of options forfeited or expired	24.11
Weighted average exercise price of options outstanding, June 30, 2016	$ 41.58
Weighted average remaining contractual life of options outstanding at June 30, 2016	3 years 329 days
Aggregate intrinsic value of options outstanding at June 30, 2016	$ 7,109
Vested and expected to vest at June 30, 2016	1,536
Weighted average exercise price of options vested and expected to vest at June 30, 2016	$ 41.44
Weighted average remaining contractual life of options vested and expected to vest at June 30, 2016	3 years 329 days
Aggregate intrinsic value of options vested and expected to vest at June 30, 2016	$ 7,094
Exercisable at June 30, 2016	1,102
Weighted average exercise price of options exercisable at June 30, 2016	$ 38.48
Weighted average remaining contractual life of options exercisable at June 30, 2016	3 years
Aggregate intrinsic value of options exercisable at June 30, 2016	$ 6,932
Total intrinsic value of options exercised	400	$ 2,500
Total cash received as a result of stock option exercises, net of taxes	700
Total unrecognized compensation cost related to unvested stock options	$ 4,300
Weighted average period of recognition for unrecognized compensation cost related to unvested stock options	2 years 37 days