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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract] |  |  |  |
Net unrealized gains (losses) on securities arising during the period, taxes | $ 1,049 | $ (689) | $ 7,081 | $ (1,261)
Less: reclassification adjustment for net realized gains included in net income, taxes | 0 | 0 | 488 | 53
Less: reclassification adjustment to net income, tax benefits | 37 | 37 | 112 | 112
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, tax benefits | 3,697 | 2,443 | 11,173 | 7,321
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes | $ 3,284 | $ 2,129 | $ 9,852 | $ 6,386

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