INCOME TAXES: (Details 4) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Activity related to accrued unrecognized tax benefits
Balance at the beginning of the period			$ 16,883,000	$ 25,965,000	$ 26,088,000
Reductions related to prior year tax positions	6,100,000			(8,928,000)	(123,000)
Increases related to current year tax positions			1,450,000	693,000
Reductions related to settlements with taxing authorities			(2,910,000)	(847,000)
Reductions related to expiration of the applicable statute of limitations			(8,285,000)
Balance at the end of the period			7,138,000	16,883,000	25,965,000
Reduction in liability for unrecognized tax benefits related to continuing operations		5,100,000		11,200,000
Accrued interest and penalties related to unrecognized tax benefits			700,000	1,200,000	1,500,000
Maximum expected reduction in liability over next twelve months for unrecognized tax benefits related to continuing operations due to statue of limitations			$ 4,300,000