STOCK BASED COMPENSATION: (Tables)

12 Months Ended

Dec. 31, 2016

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

			2016			2015
	Number		Weighted Average Grant Date	Number		Weighted Average Grant Date
(shares in thousands)	Outstanding		Fair Value	Outstanding		Fair Value
Nonvested balance at January 1,	20,466		33.26	22,084		31.63
Granted during the year	20,943		32.35	19,683		33.87
Vested during the year	(20,885	)	32.76	(21,301	)	32.13
Forfeited during the year	—		—	—		—
Nonvested balance at December 31,	20,524		32.83	20,466		33.26