INCOME TAXES: (Details 3) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Changes in the total gross unrecognized tax benefit liabilities, including accrued interest
Balance at beginning of period		$ 3,043,000	$ 6,379,000	$ 5,364,000
Additions based on tax positions related to the current year		189,000	360,000	566,000
Reduction due to lapsing of statute of limitations	(3,500,000)	(94,000)	(3,460,000)
Addition based on tax positions taken in prior years				449,000
Reduction based on tax positions taken in prior years		(29,000)	(236,000)
Balance at end of period included in other liabilities		3,109,000	3,043,000	6,379,000
Interest and penalties related to unrecognized tax benefits
Interest expense and penalties		100,000
Accrued interest and penalties		500,000
U.S. federal
Operating loss carryforwards
Net operating loss carryforwards		15,400,000
State
Operating loss carryforwards
Net operating loss carryforwards		77,000,000
Valuation allowances against loss carryforwards		38,200,000
Foreign
Operating loss carryforwards
Net operating loss carryforwards		138,500,000
Foreign net operating loss carryforwards having no expiration dates		$ 132,400,000