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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net unrealized gains (losses) on securities arising during the period, taxes $ (1,925) $ 2,439 $ (6,830) $ 161
Reclassification adjustment for net realized gain included in net income, taxes 238 0 238 0
Effective portion of foreign currency hedge net unrealized gain, taxes 475 0 (163) 0
Less: reclassification adjustment to net income, net of tax benefits 0 38 35 75
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 2,362 3,691 4,619 7,177
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes $ 2,166 $ 3,359 $ 4,218 $ 6,486