DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES: (Details 1) (Not Designated As Hedging Instrument [Member], Employment Agreement Award [Member], Corporate Selling General and Administrative Expense [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Not Designated As Hedging Instrument [Member] | Employment Agreement Award [Member] | Corporate Selling General and Administrative Expense [Member]
Amount of Gain (Loss) in Income of Derivative	$ 462	$ 350