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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension and retiree medical benefits:    
Amortization of losses included in net periodic benefit cost, tax $ 142 $ 569
Derivative instruments:    
Net fair value increase (decrease), tax (2) (7)
Reclassification of losses to net income, tax 604 382
Marketable securities:    
Net fair value increase (decrease), tax $ 0 $ 0