GOODWILL AND INTANGIBLE ASSETS: (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Changes in carrying amount of trademarks
Accumulated impairment losses of goodwill	$ 0
Trademarks
Changes in carrying amount of trademarks
Original cost	193,767	$ 193,767
Accumulated impairment losses, balance at the beginning of the period	(18,743)
Carrying amount, balance at the beginning of the period	$ 175,024	$ 175,024
Current year impairment losses
Carrying amount, balance at the end of the period	$ 175,024	$ 175,024
Accumulated impairment losses, balance at the end of the period	$ (18,743)	$ (18,743)