STOCK BASED COMPENSATION: (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Restricted Stock Units, Vested and Expected to Vest

			2015			2014
	Number		Weighted Average Grant Date	Number		Weighted Average Grant Date
(shares in thousands)	Outstanding		Fair Value	Outstanding		Fair Value
Nonvested balance at January 1,	22,084		31.63	30,496		33.49
Granted during the year	19,683		33.87	22,019		32.17
Vested during the year	(21,301	)	32.13	(30,431	)	33.52
Forfeited during the year	—		—	—		—
Nonvested balance at December 31,	20,466		33.26	22,084		31.63