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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 (shares) at Sep. 30, 2017 |  |  |  | 86,556,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2017 |  | $ 1,236,643 |  | $ 222,258 | $ 219,696 | $ (3,256) | $ (70,039) | $ 867,984
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 123,699 |  |  |  |  |  | 123,699
Other comprehensive income |  | (5,204) |  |  |  | (5,204) |  |
Common stock issued: |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 525,000 |  |  |  |
Incentive compensation plan |  | 15,404 |  | $ 1,453 | 13,951 |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 90,000 |  |  |  |
Dividend reinvestment plan | [1] | 3,799 |  |  | 245 |  | 3,554 |
Waiver discount (in shares) |  |  |  | 554,000 |  |  |  |
Waiver discount |  | 22,690 |  | $ 1,384 | 21,306 |  |  |
Cash dividend declared |  | (23,831) |  |  |  |  |  | (23,831)
Treasury stock and other (shares) |  |  |  | (250,000) |  |  |  |
Treasury stock and other |  | 25,430 |  |  | 56 |  | 25,374 |
Balance as of end of period (shares) at Dec. 31, 2017 |  |  |  | 87,475,000 |  |  |  |
Balance as of end of period at Dec. 31, 2017 |  | 1,347,770 |  | $ 225,095 | 255,142 | (8,460) | (91,859) | 967,852
Balance as of beginning of period (shares) at Sep. 30, 2017 |  |  |  | 86,556,000 |  |  |  |
Balance as of beginning of period at Sep. 30, 2017 |  | 1,236,643 |  | $ 222,258 | 219,696 | (3,256) | (70,039) | 867,984
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | [2] | 249,691 |  |  |  |  |  |
Other comprehensive income |  | (12,624) |  |  |  |  |  |
Balance as of end of period (shares) at Jun. 30, 2018 |  |  |  | 88,212,000 |  |  |  |
Balance as of end of period at Jun. 30, 2018 |  | 1,449,962 |  | $ 226,189 | 274,138 | (15,880) | (80,405) | 1,045,920
Balance as of beginning of period (shares) at Dec. 31, 2017 |  |  |  | 87,475,000 |  |  |  |
Balance as of beginning of period at Dec. 31, 2017 |  | 1,347,770 |  | $ 225,095 | 255,142 | (8,460) | (91,859) | 967,852
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 140,266 |  |  |  |  |  | 140,266
Other comprehensive income |  | (5,328) |  |  |  | (5,328) |  |
Common stock issued: |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 30,000 |  |  |  |
Incentive compensation plan |  | 1,125 |  | $ 78 | 1,047 |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 152,000 |  |  |  |
Dividend reinvestment plan | [1] | 5,956 |  |  | (73) |  | 6,029 |
Cash dividend declared |  | (23,886) |  |  |  |  |  | (23,886)
Treasury stock and other (shares) |  |  |  | (1,000) |  |  |  |
Treasury stock and other |  | 1,471 |  |  | 42 |  | 1,429 |
Balance as of end of period (shares) at Mar. 31, 2018 |  |  |  | 87,656,000 |  |  |  |
Balance as of end of period at Mar. 31, 2018 |  | 1,467,374 |  | $ 225,173 | 256,158 | (13,788) | (84,401) | 1,084,232
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | (14,274) | [2] |  |  |  |  | (14,274)
Other comprehensive income |  | (2,092) |  |  |  | (2,092) |  |
Common stock issued: |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 3,000 |  |  |  |
Incentive compensation plan |  | 8 |  | $ (135) | 143 |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 92,000 |  |  |  |
Dividend reinvestment plan | [1] | 3,642 |  |  | 1 |  | 3,641 |
Waiver discount (in shares) |  |  |  | 460,000 |  |  |  |
Waiver discount |  | 18,987 |  | $ 1,151 | 17,836 |  | 0 |
Cash dividend declared |  | (24,038) |  |  |  |  |  | (24,038)
Treasury stock and other (shares) |  |  |  | 1,000 |  |  |  |
Treasury stock and other |  | 355 |  |  |  |  | 355 |
Balance as of end of period (shares) at Jun. 30, 2018 |  |  |  | 88,212,000 |  |  |  |
Balance as of end of period at Jun. 30, 2018 |  | $ 1,449,962 |  | $ 226,189 | 274,138 | (15,880) | (80,405) | 1,045,920
Balance as of beginning of period (shares) at Sep. 30, 2018 |  | 88,292,956 |  | 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 (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 (shares) at Sep. 30, 2018 |  | 88,292,956 |  | 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 | [2] | 151,419 |  |  |  |  |  |
Other comprehensive income |  | $ 844 |  |  |  |  |  |
Balance as of end of period (shares) at Jun. 30, 2019 |  | 89,917,854 |  | 89,918,000 |  |  |  |
Balance as of end of period at Jun. 30, 2019 |  | $ 1,572,197 |  | $ 226,627 | 290,414 | (15,212) | (15,628) | 1,085,996
Balance as of beginning of period (shares) at Dec. 31, 2018 |  |  |  | 88,680,000 |  |  |  |
Balance as of beginning of period at Dec. 31, 2018 |  | 1,497,050 |  | $ 226,539 | 278,286 | (15,822) | (65,060) | 1,073,107
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | 73,573 |  |  |  |  |  | 73,573
Other comprehensive income |  | 305 |  |  |  | 305 |  |
Common stock issued: |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 30,000 |  |  |  |
Incentive compensation plan |  | 1,224 |  | $ 74 | 1,150 |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 123,000 |  |  |  |
Dividend reinvestment plan | [1] | 5,762 |  |  | 870 |  | 4,892 |
Waiver discount (in shares) |  |  |  | 339,000 |  |  |  |
Waiver discount |  | 16,575 |  |  | 3,123 |  | 13,452 |
Cash dividend declared |  | (25,981) |  |  |  |  |  | (25,981)
Treasury stock and other (shares) |  |  |  | (8,000) |  |  |  |
Treasury stock and other |  | 654 |  |  |  |  | 654 |
Balance as of end of period (shares) at Mar. 31, 2019 |  |  |  | 89,164,000 |  |  |  |
Balance as of end of period at Mar. 31, 2019 |  | 1,569,162 |  | $ 226,613 | 283,429 | (15,517) | (46,062) | 1,120,699
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income |  | (8,402) | [2] |  |  |  |  | (8,402)
Other comprehensive income |  | 305 |  |  |  | 305 |  |
Common stock issued: |  |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  |  | 6,000 |  |  |  |
Incentive compensation plan |  | 208 |  | $ 14 | 194 |  |  |
Dividend reinvestment plan (in shares) | [1] |  |  | 74,000 |  |  |  |
Dividend reinvestment plan | [1] | 3,632 |  |  | 676 |  | 2,956 |
Waiver discount (in shares) |  |  |  | 674,000 |  |  |  |
Waiver discount |  | 32,852 |  |  | 6,115 |  | 26,737 |
Cash dividend declared |  | (26,301) |  |  |  |  |  | (26,301)
Treasury stock and other (shares) |  |  |  | 0 |  |  |  |
Treasury stock and other |  | $ 741 |  |  |  |  | 741 |
Balance as of end of period (shares) at Jun. 30, 2019 |  | 89,917,854 |  | 89,918,000 |  |  |  |
Balance as of end of period at Jun. 30, 2019 |  | $ 1,572,197 |  | $ 226,627 | $ 290,414 | $ (15,212) | $ (15,628) | $ 1,085,996
[1] | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
[2] | Includes income tax benefit related to the Tax Act of $844,000 and $57.7 million, for the three and nine months ended June 30, 2018, respectively.

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