RETIREMENT PLANS: (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ 4,470	$ 4,130
Change in benefit obligation:
Benefit obligation at January 1	109,922	102,791
Service cost	1,355	1,300	$ 1,218
Interest cost	2,632	3,116	3,465
Actuarial (gain) loss	(2,943)	6,845
Benefits paid	(4,470)	(4,130)
Benefit obligation at December 31	106,496	109,922	102,791
Reconciliation of fair value of plan assets:
Fair value of plan assets at January 1	82,437	73,962
Actual return on plan assets	7,654	7,856
Employer contributions	2,358	4,749
Fair value of plan assets at December 31	87,979	82,437	$ 73,962
Funded status at December 31 (plan assets less benefit obligation)	$ (18,517)	$ (27,485)