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RETIREMENT PLANS: (Details 7) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
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
Supplemental Employee Retirement Plans, Defined Benefit [Member]
     
Net loss (gain) during the period 442 486 (90)
Amortization of prior service cost 0 (74) (74)
Amortization of unrecognized gain (loss) (79) 39 66
Total recognized in other comprehensive income (loss) $ 363 $ 451 $ (98)