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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Common stock | Retained earnings | AOCI
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2015 | $ 1,927,640 | $ 1,629,136 | $ 324,766 | $ (26,262)
Balance (in shares) at Dec. 31, 2015 |  | 107,460,000 |  |
Increase (decrease) in stockholders' equity |  |  |  |
Net income for common stock | 248,256 |  | 248,256 |
Other comprehensive income (loss), net of tax benefits | (6,867) |  |  | (6,867)
Issuance of common stock: Dividend reinvestment and stock purchase plan | 26,844 | $ 26,844 |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan (in shares) |  | 859,000 |  |
Issuance of common stock: Retirement savings and other plans | 9,298 | $ 9,298 |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 264,000 |  |
Issuance of common stock: Expenses and other, net | (4,368) | $ (4,368) |  |
Common stock dividends | (134,050) |  | (134,050) |
Ending Balance at Dec. 31, 2016 | 2,066,753 | $ 1,660,910 | 438,972 | (33,129)
Balance (in shares) at Dec. 31, 2016 |  | 108,583,000 |  |
Increase (decrease) in stockholders' equity |  |  |  |
Net income for common stock | 165,297 |  | 165,297 |
Other comprehensive income (loss), net of tax benefits | (1,372) |  |  | (1,372)
Reclass of AOCI for tax rate reduction impact | 0 |  | 7,440 | (7,440)
Issuance of common stock: Retirement savings and other plans | 4,664 | $ 4,664 |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 205,000 |  |
Issuance of common stock: Expenses and other, net | (3,083) | $ (3,083) |  |
Common stock dividends | (134,873) |  | (134,873) |
Ending Balance at Dec. 31, 2017 | $ 2,097,386 | $ 1,662,491 | 476,836 | (41,941)
Balance (in shares) at Dec. 31, 2017 | 108,787,807 | 108,788,000 |  |
Increase (decrease) in stockholders' equity |  |  |  |
Net income for common stock | $ 201,774 |  | 201,774 |
Other comprehensive income (loss), net of tax benefits | (8,669) |  |  | (8,669)
Issuance of common stock: Retirement savings and other plans | 2,650 | $ 2,650 |  |
Issuance of common stock: Retirement savings and other plans (in shares) |  | 91,000 |  |
Issuance of common stock: Expenses and other, net | 4,126 | $ 4,126 |  |
Common stock dividends | (134,987) |  | (134,987) |
Ending Balance at Dec. 31, 2018 | $ 2,162,280 | $ 1,669,267 | $ 543,623 | $ (50,610)
Balance (in shares) at Dec. 31, 2018 | 108,879,245 | 108,879,000 |  |

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