UNAUDITED SELECTED 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
UNAUDITED SELECTED QUARTERLY FINANCIAL DATA:
Revenue	$ 224,867	$ 223,312	$ 217,267	$ 214,801	$ 224,655	$ 221,193	$ 207,345	$ 196,895	$ 880,247	$ 850,088	$ 804,911
Gross profit	106,573	106,844	97,162	91,982	101,029	95,458	86,033	79,186	402,561	361,706	310,874
Loss from operations	(8,709)	9,115	7,120	8,162	(7,764)	(374)	(2,056)	(2,869)	15,689	(13,063)	(32,684)
Net earnings (loss) from discontinued operations, net of tax					111	(971)	12,068	4,143		15,351	15,511
Net earnings (loss)	$ (8,081)	$ 1,073	$ 7,140	$ 3,976	$ (1,571)	$ (1,410)	$ 10,723	$ (1,039)	$ 4,108	$ 6,703	$ (11,031)
Basic earnings (loss) per share:
Continuing operations (in dollars per share)					$ (0.02)	$ (0.01)	$ (0.02)	$ (0.07)	$ 0.05	$ (0.11)	$ (0.34)
Discontinued operations (in dollars per share)					0.00	(0.01)	0.15	0.05		0.20	0.20
Net earnings (loss) (in dollars per share)	$ (0.10)	$ 0.01	$ 0.09	$ 0.05	(0.02)	(0.02)	0.14	(0.01)	0.05	0.09	(0.14)
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)					(0.02)	(0.01)	(0.02)	(0.07)	0.05	(0.11)	(0.34)
Net earnings from discontinued operations (in dollars per share)					0.00	(0.01)	0.15	0.05		0.20	0.20
Net earnings (loss) (in dollars per share)	$ (0.10)	$ 0.01	$ 0.09	$ 0.05	$ (0.02)	$ (0.02)	$ 0.14	$ (0.01)	$ 0.05	$ 0.09	$ (0.14)