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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, 2020 |  |  | 95,949,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2020 |  | $ 1,643,896 | $ 240,243 | $ 491,982 | $ (44,315) | $ 8,485 | $ 947,501
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 81,045 |  |  |  |  | 81,045
Other comprehensive income |  | 1,043 |  |  | 1,043 |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 50,000 |  |  |  |
Incentive compensation plan |  | 5,534 | $ 124 | 5,410 |  |  |
Dividend reinvestment plan (in shares) | [1] |  | 140,000 |  |  |  |
Dividend reinvestment plan | [1] | 1,091 |  | (4,502) |  | 5,593 |
Cash dividend declared |  | (31,966) |  |  |  |  | (31,966)
Treasury stock and other |  | (2,429) |  |  |  | (2,429) |
Balance as of end of period (in shares) at Dec. 31, 2020 |  |  | 96,139,000 |  |  |  |
Balance as of end of period at Dec. 31, 2020 |  | $ 1,698,214 | $ 240,367 | 492,890 | (43,272) | 11,649 | 996,580
Balance as of beginning of period (in shares) at Sep. 30, 2021 |  | 95,709,662 | 95,710,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2021 |  | $ 1,630,862 | $ 240,644 | 502,584 | (34,528) | (12,448) | 934,610
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 111,312 |  |  |  |  | 111,312
Other comprehensive income |  | 1,030 |  |  | 1,030 |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 147,000 |  |  |  |
Incentive compensation plan |  | 7,502 | $ 367 | 7,135 |  |  |
Dividend reinvestment plan (in shares) |  |  | 105,000 |  |  |  |
Dividend reinvestment plan |  | 3,678 | $ 263 | 3,415 |  |  |
Cash dividend declared |  | (34,787) |  |  |  |  | (34,787)
Treasury stock and other (in shares) |  |  | 0 |  |  |  |
Treasury stock and other |  | $ (2,619) |  |  |  | (2,619) |
Balance as of end of period (in shares) at Dec. 31, 2021 |  | 95,961,710 | 95,962,000 |  |  |  |
Balance as of end of period at Dec. 31, 2021 |  | $ 1,716,978 | $ 241,274 | $ 513,134 | $ (33,498) | $ (15,067) | $ 1,011,135
[1] | Shares sold through the DRP issued from treasury stock at average cost, which may differ from the actual market price paid.

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