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RETIREMENT PLANS: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Service cost - benefits earned $ 4,872 $ 3,542 $ 3,093
Interest cost on projected benefit obligation 3,667 3,688 3,313
Expected return on plan assets (3,258) (4,003) (3,400)
Net amortization and deferral 2,434 1,152 964
Net periodic pension cost 7,715 4,379 3,970
Net loss (gain) during the period 3,842 17,868 4,466
Curtailment gain (5,700) 0 0
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 pension cost and other comprehensive income $ 3,421 $ 21,095 $ 7,472