EARNINGS PER SHARE ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Computation of Basic earnings per share:
Net income	$ 46,280	$ 71,693
Weighted average shares outstanding—basic (in shares)	112,621	112,941
Basic earnings per share (in dollars per share)	$ 0.41	$ 0.63
Computation of Diluted earnings per share:
Net income	$ 46,280	$ 71,693
Add: interest expense, net of tax, on Convertible Notes	0	95
Net income (loss) for diluted earnings (loss) per share calculation	$ 46,280	$ 71,788
Weighted average common shares outstanding—basic (in shares)	112,621	112,941
Add: dilutive effect of common stock equivalents (in shares)	1,107	3,044
Weighted average common shares outstanding—diluted (in shares)	113,728	115,985
Diluted earnings per share (in dollars per share)	$ 0.41	$ 0.62