RESTRUCTURING, IMPAIRMENT AND OTHER CHARGES: (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restructuring costs and other charges
Gains, losses and other items			$ 2,010	$ 12,638	$ 4,600
Gains, losses and other items
Restructuring costs and other charges
Restructuring charges and adjustments	2,900		2,894	12,778	4,435
Earnout liability adjustment (see note 3)				(2,598)	(1,058)
Other	(900)		(884)	2,458	1,223
Gains, losses and other items		$ 12,600	$ 2,010	$ 12,638	$ 4,600