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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Surplus | Accumulated Other Comprehensive Income (Loss) | Undivided Profits
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 2,084,564 |  | $ 920 | $ 1,586,034 | $ (17,264) | $ 514,874
Comprehensive income | 129,291 |  |  |  | (30,776) | 160,067
Stock issued for employee stock purchase plan | 1,026 |  |  | 1,026 |  |
Stock-based compensation plans, net | 10,204 |  | 3 | 10,201 |  |
Dividends on common stock | (41,766) |  |  |  |  | (41,766)
Balance at Sep. 30, 2018 | 2,183,319 |  | 923 | 1,597,261 | (48,040) | 633,175
Balance at Jun. 30, 2018 | 2,146,908 |  | 923 | 1,594,342 | (40,183) | 591,826
Comprehensive income | 47,336 |  |  |  | (7,857) | 55,193
Stock-based compensation plans, net | 2,919 |  | 0 | 2,919 |  |
Dividends on common stock | (13,844) |  |  |  |  | (13,844)
Balance at Sep. 30, 2018 | 2,183,319 |  | 923 | 1,597,261 | (48,040) | 633,175
Balance at Dec. 31, 2018 | 2,246,434 |  | 923 | 1,597,944 | (27,374) | 674,941
Comprehensive income | 236,528 |  |  |  | 51,083 | 185,445
Stock issued for employee stock purchase plan | 1,312 |  | 1 | 1,311 |  |
Stock-based compensation plans, net | 6,015 |  | 2 | 6,013 |  |
Stock issued for Reliance acquisition | 144,830 | $ 42,000 | 40 | 102,790 |  |
Preferred stock retirement | (42,000) | $ (42,000) |  |  |  |
Dividends on preferred stock | (326) |  |  |  |  | (326)
Dividends on common stock | (45,722) |  |  |  |  | (45,722)
Balance at Sep. 30, 2019 | 2,547,071 |  | 966 | 1,708,058 | 23,709 | 814,338
Balance at Jun. 30, 2019 | 2,469,513 |  | 966 | 1,705,262 | 15,316 | 747,969
Comprehensive income | 90,219 |  |  |  | 8,393 | 81,826
Stock-based compensation plans, net | 2,796 |  |  | 2,796 |  |
Dividends on common stock | (15,457) |  |  |  |  | (15,457)
Balance at Sep. 30, 2019 | $ 2,547,071 |  | $ 966 | $ 1,708,058 | $ 23,709 | $ 814,338

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