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RETIREMENT PLANS: (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract] |  |  |
Net loss (gain) | $ 33,502 | $ 29,544 |
Prior service cost (credit) | (1) | 9 | $ 16
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax | 6 | 5 |
Pension and other postretirement benefit plans, adjustment | $ 33,508 | $ 29,549 |

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