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CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Premium on Common Stock | Accumulated Other Comprehensive (Loss) Income | Treasury Stock And Other | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance as of beginning of period (in shares) at Sep. 30, 2018 |  |  | 88,293,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2018 |  | $ 1,418,978 | $ 226,196 | $ 274,748 | $ (12,610) | $ (76,473) | $ 1,007,117
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 86,248 |  |  |  |  | 86,248
Other comprehensive income |  | 234 |  |  | 234 |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 137,000 |  |  |  |
Incentive compensation plan |  | 2,134 | $ 343 | 1,791 |  |  |
Dividend reinvestment plan (in shares) | [1] |  | 82,000 |  |  |  |
Dividend reinvestment plan | [1] | 3,692 |  | 454 |  | 3,238 |
Waiver discount (in shares) |  |  | 168,000 |  |  |  |
Waiver discount |  | 7,964 |  | 1,293 |  | 6,671 |
Cash dividend declared |  | (25,938) |  |  |  |  | (25,938)
Treasury stock and other |  | 1,504 |  |  |  | 1,504 |
Balance as of end of period (in shares) at Dec. 31, 2018 |  |  | 88,680,000 |  |  |  |
Balance as of end of period at Dec. 31, 2018 |  | $ 1,497,050 | $ 226,539 | 278,286 | (15,822) | (65,060) | 1,073,107
Balance as of beginning of period (in shares) at Sep. 30, 2019 |  | 89,998,788 | 89,999,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2019 |  | $ 1,551,717 | $ 226,649 | 291,331 | (31,787) | (10,436) | 1,075,960
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 89,361 |  |  |  |  | 89,361
Other comprehensive income |  | 759 |  |  | 759 |  |
Common stock issued: |  |  |  |  |  |  |
Common stock offering (in shares) |  |  | 5,333,000 |  |  |  |
Common stock offering |  | 212,900 | $ 13,333 | 199,567 |  |  |
Incentive compensation plan (in shares) |  |  | 96,000 |  |  |  |
Incentive compensation plan |  | 3,292 | $ 239 | 3,053 |  |  |
Dividend reinvestment plan (in shares) | [1] |  | 80,000 |  |  |  |
Dividend reinvestment plan | [1] | 3,499 |  | 314 |  | 3,185 |
Cash dividend declared |  | (29,846) |  |  |  |  | (29,846)
Treasury stock and other |  | $ 3,879 |  |  |  | 3,879 |
Balance as of end of period (in shares) at Dec. 31, 2019 |  | 95,508,009.546 | 95,508,000 |  |  |  |
Balance as of end of period at Dec. 31, 2019 |  | $ 1,827,803 | $ 240,221 | $ 494,265 | $ (31,028) | $ (11,130) | $ 1,135,475
[1] | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.

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