SUPPLEMENTARY QUARTERLY FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Duration of fiscal year									364 days	371 days	364 days
Net revenues	$ 208,954	$ 232,933	$ 216,183	$ 223,106	$ 209,797	$ 225,735	$ 215,017	$ 206,358	$ 881,176	$ 856,907	$ 865,010
Gross Profit	107,671	110,180	110,446	113,073	106,830	109,516	110,970	107,358	441,370	434,674	461,619
Net income	$ 19,517	$ 22,221	$ 20,474	$ 20,387	$ 12,980	$ 16,288	$ 17,896	$ 21,228	$ 82,599	$ 68,392	$ 112,301
Basic net income per common share (in dollars per share)	$ 0.60	$ 0.69	$ 0.63	$ 0.63	$ 0.40	$ 0.50	$ 0.53	$ 0.56	$ 2.56	$ 2.00	$ 2.69
Diluted net income per common share (in dollars per share)	0.59	0.68	0.63	0.62	0.39	0.49	0.52	0.55	2.51	1.96	2.63
Cash dividends declared per common share (in dollars per share)	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.60	$ 0.60	$ 0.60