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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Pension and retiree medical benefits:    
Amortization of (gains) losses included in net periodic benefit cost, tax $ 2,503 $ 622
Derivative instruments:    
Net fair value increase, tax 12 16,491
Reclassification of (gains) losses to net income, tax 1,429 156
Marketable securities:    
Net fair value (decrease) increase, tax $ (18) $ 36