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RETIREMENT PLANS: (Details 9) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in benefit obligation:      
Benefit obligation at January 1 $ 84,908 $ 67,006  
Service cost 4,872 3,542 3,093
Interest cost 3,667 3,688 3,313
Actuarial (gain) loss (4,747) 12,689  
Benefits paid (1,893) (2,017)  
Benefit obligation at December 31 86,807 84,908 67,006
Funded status at December 31 (29,316) (30,973)  
Supplemental Employee Retirement Plans, Defined Benefit [Member]
     
Change in benefit obligation:      
Benefit obligation at January 1 4,057 4,500  
Service cost 60 61  
Interest cost 173 194  
Plan participants' contributions 62 62  
Actuarial (gain) loss 311 (472)  
Benefits paid (268) (288)  
Benefit obligation at December 31 4,395 4,057  
Funded status at December 31 $ 4,395 $ 4,057