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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net unrealized gains (losses) on securities arising during the period, taxes $ 4,905 $ 2,278
Effective portion of foreign currency hedge net unrealized gain, taxes 638 0
Less: reclassification adjustment to net income, net of tax benefits 35 37
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 2,257 3,486
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes $ 2,052 $ 3,127