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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net unrealized gains (losses) on securities arising during the period, taxes $ 1,417 $ (2,543) $ (5,413) $ (2,382)
Reclassification adjustment for net realized gain included in net income, taxes 0 0 238 0
Effective portion of foreign currency hedge net unrealized gain, taxes (205) 0 (368) 0
Less: reclassification adjustment to net income, net of tax benefits (110) 37 (75) 112
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 2,324 3,583 6,943 10,760
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes $ 2,109 $ 3,243 $ 6,327 $ 9,729