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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common stock | Retained earnings | Accumulated other comprehensive income (loss) | Comprehensive income
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 1,389,454 | $ 1,231,629 | $ 210,840 | $ (53,015) |
Balance (in shares) at Dec. 31, 2008 |  | 90,516,000 |  |  |
Increase (decrease) in stockholders' equity |  |  |  |  |
Cumulative effect of adoption of a standard on other-than-temporary Impairment recognition, net of taxes of $2,497 |  |  | 3,781 | (3,781) |
Comprehensive income: |  |  |  |  |
Net income for common stock | 83,011 |  | 83,011 |  | 83,011
Net unrealized gains (losses) on securities: |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, net of taxes of $4,343, $789 and $8,543 in 2011, 2010 and 2009, respectively | 12,938 |  |  | 12,938 | 12,938
Less: reclassification adjustment for net realized gains (losses) included in net income, net of taxes of $148 and $18,882 in 2011 and 2009, respectively | 28,596 |  |  | 28,596 | 28,596
Retirement benefit plans: |  |  |  |  |
Net transition asset arising during the period, net of taxes of $4,172 | 6,549 |  |  | 6,549 | 6,549
Prior service credit arising during the period, net of taxes of $4,422, $3,001 and $921 in 2011, 2010 and 2009, respectively | 1,446 |  |  | 1,446 | 1,446
Net gains (losses) arising during the period, net of tax benefits of $83,147, $28,431 and $41,218 in 2011, 2010 and 2009, respectively | 64,547 |  |  | 64,547 | 64,547
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $5,976, $2,566 and $6,861 in 2011, 2010 and 2009, respectively | 10,754 |  |  | 10,754 | 10,754
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of tax benefits of $64,134, $21,336 and $48,251 in 2011, 2010 and 2009, respectively | (75,756) |  |  | (75,756) | (75,756)
Other comprehensive income (loss) |  |  |  | 49,074 |
Comprehensive income | 132,085 |  |  |  | 132,085
Issuance of common stock: Dividend reinvestment and stock purchase plan | 27,701 | 27,701 |  |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan (in shares) |  | 1,714,000 |  |  |
Issuance of common stock: Retirement savings and other plans | 4,771 | 4,771 |  |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 291,000 |  |  |
Issuance of common stock: Expenses and other, net | 1,056 | 1,056 |  |  |
Common stock dividends ($1.24 per share) | (113,419) |  | (113,419) |  |
Balance at Dec. 31, 2009 | 1,441,648 | 1,265,157 | 184,213 | (7,722) |
Balance (in shares) at Dec. 31, 2009 |  | 92,521,000 |  |  |
Comprehensive income: |  |  |  |  |
Net income for common stock | 113,535 |  | 113,535 |  | 113,535
Net unrealized gains (losses) on securities: |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, net of taxes of $4,343, $789 and $8,543 in 2011, 2010 and 2009, respectively | (1,196) |  |  | (1,196) | (1,196)
Derivatives qualified as cash flow hedges: |  |  |  |  |
Net unrealized holding losses arising during the period, net of tax benefits of $4 and $745 in 2011 and 2010, respectively | (1,169) |  |  | (1,169) | (1,169)
Retirement benefit plans: |  |  |  |  |
Prior service credit arising during the period, net of taxes of $4,422, $3,001 and $921 in 2011, 2010 and 2009, respectively | 4,712 |  |  | 4,712 | 4,712
Net gains (losses) arising during the period, net of tax benefits of $83,147, $28,431 and $41,218 in 2011, 2010 and 2009, respectively | (44,626) |  |  | (44,626) | (44,626)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $5,976, $2,566 and $6,861 in 2011, 2010 and 2009, respectively | 4,030 |  |  | 4,030 | 4,030
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of tax benefits of $64,134, $21,336 and $48,251 in 2011, 2010 and 2009, respectively | 33,499 |  |  | 33,499 | 33,499
Other comprehensive income (loss) |  |  |  | (4,750) |
Comprehensive income | 108,785 |  |  |  | 108,785
Issuance of common stock: Dividend reinvestment and stock purchase plan | 37,296 | 37,296 |  |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan (in shares) |  | 1,685,000 |  |  |
Issuance of common stock: Retirement savings and other plans | 8,934 | 8,934 |  |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 485,000 |  |  |
Issuance of common stock: Expenses and other, net | 2,812 | 2,812 |  |  |
Common stock dividends ($1.24 per share) | (115,838) |  | (115,838) |  |
Balance at Dec. 31, 2010 | 1,483,637 | 1,314,199 | 181,910 | (12,472) |
Balance (in shares) at Dec. 31, 2010 | 94,690,932 | 94,691,000 |  |  |
Comprehensive income: |  |  |  |  |
Net income for common stock | 138,230 |  | 138,230 |  | 138,230
Net unrealized gains (losses) on securities: |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, net of taxes of $4,343, $789 and $8,543 in 2011, 2010 and 2009, respectively | 6,578 |  |  | 6,578 | 6,578
Less: reclassification adjustment for net realized gains (losses) included in net income, net of taxes of $148 and $18,882 in 2011 and 2009, respectively | (224) |  |  | (224) | (224)
Derivatives qualified as cash flow hedges: |  |  |  |  |
Net unrealized holding losses arising during the period, net of tax benefits of $4 and $745 in 2011 and 2010, respectively | (8) |  |  | (8) | (8)
Less: reclassification adjustment to net income, net of tax benefits of $115 | 181 |  |  | 181 | 181
Retirement benefit plans: |  |  |  |  |
Prior service credit arising during the period, net of taxes of $4,422, $3,001 and $921 in 2011, 2010 and 2009, respectively | 6,943 |  |  | 6,943 | 6,943
Net gains (losses) arising during the period, net of tax benefits of $83,147, $28,431 and $41,218 in 2011, 2010 and 2009, respectively | (130,191) |  |  | (130,191) | (130,191)
Less: amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $5,976, $2,566 and $6,861 in 2011, 2010 and 2009, respectively | 9,364 |  |  | 9,364 | 9,364
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of tax benefits of $64,134, $21,336 and $48,251 in 2011, 2010 and 2009, respectively | 100,692 |  |  | 100,692 | 100,692
Other comprehensive income (loss) |  |  |  | (6,665) |
Comprehensive income | 131,565 |  |  |  | 131,565
Issuance of common stock: Dividend reinvestment and stock purchase plan | 21,217 | 21,217 |  |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan (in shares) |  | 879,000 |  |  |
Issuance of common stock: Retirement savings and other plans | 10,318 | 10,318 |  |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 468,000 |  |  |
Issuance of common stock: Expenses and other, net | 3,712 | 3,712 |  |  |
Common stock dividends ($1.24 per share) | (118,500) |  | (118,500) |  |
Balance at Dec. 31, 2011 | $ 1,531,949 | $ 1,349,446 | $ 201,640 | $ (19,137) |
Balance (in shares) at Dec. 31, 2011 | 96,038,328 | 96,038,000 |  |  |

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