DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES: (Details 2) (Not Designated As Hedging Instrument [Member], Employment Agreement Award [Member], Corporate Selling General and Administrative Expense [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
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	$ (1,028)	$ (3,522)	$ (2,167)