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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 loss
--- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 1,528,706 | $ 1,349,446 | $ 198,397 | $ (19,137)
Balance (in shares) at Dec. 31, 2011 |  | 96,038,000 |  |
Increase (decrease) in stockholders' equity |  |  |  |
Net income for common stock | 124,822 |  | 124,822 |
Other comprehensive loss, net of tax benefits | 3,447 |  |  | 3,447
Issuance of common stock, net | 40,161 | 40,161 |  |
Issuance of common stock, net (in shares) |  | 1,387,000 |  |
Dividend equivalents paid on equity-classified awards | (99) |  | (99) |
Common stock dividends ($0.93 per share) | (89,902) |  | (89,902) |
Balance at Sep. 30, 2012 | 1,607,135 | 1,389,607 | 233,218 | (15,690)
Balance (in shares) at Sep. 30, 2012 |  | 97,425,000 |  |
Balance at Dec. 31, 2012 | 1,593,865 | 1,403,484 | 216,804 | (26,423)
Balance (in shares) at Dec. 31, 2012 | 97,928,403 | 97,928,000 |  |
Increase (decrease) in stockholders' equity |  |  |  |
Net income for common stock | 122,503 |  | 122,503 |
Other comprehensive loss, net of tax benefits | (9,263) |  |  | (9,263)
Issuance of common stock, net | 40,099 | 40,099 |  |
Issuance of common stock, net (in shares) |  | 1,614,000 |  |
Common stock dividends ($0.93 per share) | (91,739) |  | (91,739) |
Balance at Sep. 30, 2013 | $ 1,655,465 | $ 1,443,583 | $ 247,568 | $ (35,686)
Balance (in shares) at Sep. 30, 2013 | 99,541,518 | 99,542,000 |  |

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