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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands | Total | Common stock | Retained earnings | Accumulated other comprehensive income (loss) | Comprehensive income
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 1,441,648 | $ 1,265,157 | $ 184,213 | $ (7,722) |
Balance (in shares) at Dec. 31, 2009 |  | 92,521 |  |  |
Comprehensive income (loss): |  |  |  |  |
Net income for common stock | 56,388 |  | 56,388 |  | 56,388
Net unrealized gains on securities: |  |  |  |  |
Net unrealized gains on securities arising during the period, net of taxes of $2,341 and $1,747 in June 2011 and June 2010, respectively | 2,646 |  |  | 2,646 | 2,646
Derivatives qualified as cash flow hedges: |  |  |  |  |
Net unrealized holding losses arising during the period, net of tax benefits of $9 and $662 in June 2011 and June 2010, respectively | (1,039) |  |  | (1,039) | (1,039)
Retirement benefit plans: |  |  |  |  |
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, net of tax benefits of $2,108 and $1,248 in June 2011 and June 2010, respectively | 1,959 |  |  | 1,959 | 1,959
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,801 and $1,080 in June 2011 and June 2010, respectively | (1,697) |  |  | (1,697) | (1,697)
Other comprehensive income |  |  |  | 1,869 |
Comprehensive income | 58,257 |  |  |  | 58,257
Issuance of common stock, net | 24,314 | 24,314 |  |  |
Issuance of common stock, net (in shares) |  | 1,099 |  |  |
Common stock dividends ($0.62 per share) | (57,586) |  | (57,586) |  |
Balance at Jun. 30, 2010 | 1,466,633 | 1,289,471 | 183,015 | (5,853) |
Balance (in shares) at Jun. 30, 2010 |  | 93,620 |  |  |
Balance at Dec. 31, 2010 | 1,483,637 | 1,314,199 | 181,910 | (12,472) |
Balance (in shares) at Dec. 31, 2010 |  | 94,691 |  |  |
Comprehensive income (loss): |  |  |  |  |
Net income for common stock | 55,601 |  | 55,601 |  | 55,601
Net unrealized gains on securities: |  |  |  |  |
Net unrealized gains on securities arising during the period, net of taxes of $2,341 and $1,747 in June 2011 and June 2010, respectively | 3,435 |  |  | 3,435 | 3,435
Less: reclassification adjustment for net realized gains included in net income, net of taxes of $2 in 2011 | (3) |  |  | (3) | (3)
Derivatives qualified as cash flow hedges: |  |  |  |  |
Net unrealized holding losses arising during the period, net of tax benefits of $9 and $662 in June 2011 and June 2010, respectively | (3) |  |  | (3) | (3)
Less: reclassification adjustment to net income, net of tax benefits of $41 in 2011 | 64 |  |  | 64 | 64
Retirement benefit plans: |  |  |  |  |
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, net of tax benefits of $2,108 and $1,248 in June 2011 and June 2010, respectively | 3,488 |  |  | 3,488 | 3,488
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes of $2,801 and $1,080 in June 2011 and June 2010, respectively | (4,352) |  |  | (4,352) | (4,352)
Other comprehensive income |  |  |  | 2,629 |
Comprehensive income | 58,230 |  |  |  | 58,230
Issuance of common stock, net | 29,338 | 29,338 |  |  |
Issuance of common stock, net (in shares) |  | 1,162 |  |  |
Common stock dividends ($0.62 per share) | (58,998) |  | (58,998) |  |
Balance at Jun. 30, 2011 | $ 1,512,207 | $ 1,343,537 | $ 178,513 | $ (9,843) |
Balance (in shares) at Jun. 30, 2011 |  | 95,853 |  |  |

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