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RETIREMENT PLANS: (Details 11) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Service cost $ 4,872 $ 3,542 $ 3,093
Interest cost 3,667 3,688 3,313
Recognized actuarial loss (4,747) 12,689  
Net periodic benefit cost 7,715 4,379 3,970
Net loss (gain) during the period 3,842 17,868 4,466
Amortization of prior service cost 166 166 (18)
Amortization of unrecognized gain (loss) (2,270) (986) (982)
Total recognized in other comprehensive income (loss) (4,294) 16,716 3,502
Total recognized net periodic benefit cost and other comprehensive income 3,421 21,095 7,472
Post Retirement Medical Benefits [Member]
      
Service cost 60 59 64
Interest cost 173 194 218
Amortization of transition obligation 60 60 60
Recognized actuarial loss 0 0 12
Net periodic benefit cost 293 313 354
Net loss (gain) during the period 311 (469) 0
Amortization of prior service cost (60) (60) (60)
Amortization of unrecognized gain (loss) 0 0 (153)
Total recognized in other comprehensive income (loss) 251 (529) (213)
Total recognized net periodic benefit cost and other comprehensive income $ 544 $ (216) $ 141