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CONSOLIDATED STATEMENTS OF COMMON STOCK EQUITY - USD ($) $ in Thousands | Total | Common Stock | Premium on Common Stock | Accumulated Other Comprehensive (Loss) Income | Treasury Stock And Other | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2015 |  |  | 85,531,000 |  |  |  |
Beginning Balance at Sep. 30, 2015 |  | $ 1,106,956 | $ 220,838 | $ 209,931 | $ (9,394) | $ (92,164) | $ 777,745
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 131,672 |  |  |  |  | 131,672
Other comprehensive loss |  | (5,761) |  |  | (5,761) |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 325,000 |  |  |  |
Incentive compensation plan |  | 9,399 | $ 816 | 8,583 |  |  |
Divident reinvestment plan (in shares) | [1] |  | 471,000 |  |  |  |
Dividend reinvestment plan | [1] | 16,063 |  | (2,879) |  | 18,942 |
Cash dividend declared ($1.11 per share in 2018, $1.0375 per share in 2017, and $.975 per share in 2016) |  | (83,861) |  |  |  |  | (83,861)
Treasury stock and other (in shares) |  |  | (241,000) |  |  |  |
Treasury stock and other |  | (7,877) |  | (55) |  | (7,822) |
Ending Balance (in shares) at Sep. 30, 2016 |  |  | 86,086,000 |  |  |  |
Ending Balance at Sep. 30, 2016 |  | 1,166,591 | $ 221,654 | 215,580 | (15,155) | (81,044) | 825,556
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income |  | 132,065 |  |  |  |  | 132,065
Other comprehensive loss |  | 11,899 |  |  | 11,899 |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 241,000 |  |  |  |
Incentive compensation plan |  | 5,694 | $ 604 | 5,090 |  |  |
Divident reinvestment plan (in shares) | [1] |  | 472,000 |  |  |  |
Dividend reinvestment plan | [1] | 17,622 |  | (946) |  | 18,568 |
Cash dividend declared ($1.11 per share in 2018, $1.0375 per share in 2017, and $.975 per share in 2016) |  | (89,637) |  |  |  |  | (89,637)
Treasury stock and other (in shares) |  |  | (243,000) |  |  |  |
Treasury stock and other |  | $ (7,591) |  | (28) |  | (7,563) |
Ending Balance (in shares) at Sep. 30, 2017 |  | 86,555,507 | 86,556,000 |  |  |  |
Ending Balance 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 |  | 233,436 |  |  |  |  | 233,436
Other comprehensive loss |  | (6,078) |  |  | (6,078) |  |
Common stock issued: |  |  |  |  |  |  |
Incentive compensation plan (in shares) |  |  | 561,000 |  |  |  |
Incentive compensation plan |  | 16,572 | $ 1,403 | 15,169 |  |  |
Divident reinvestment plan (in shares) | [1] |  | 413,000 |  |  |  |
Dividend reinvestment plan | [1] | 17,094 |  | 755 |  | 16,339 |
Waiver discount (in shares) |  |  | 1,014,000 |  |  |  |
Waiver discount |  | 41,677 | $ 2,535 | 39,142 |  |  |
Cash dividend declared ($1.11 per share in 2018, $1.0375 per share in 2017, and $.975 per share in 2016) |  | (97,579) |  |  |  |  | (97,579)
Treasury stock and other (in shares) |  |  | (251,000) |  |  |  |
Treasury stock and other |  | $ (22,787) |  | (14) |  | (22,773) |
Ending Balance (in shares) at Sep. 30, 2018 |  | 88,292,956 | 88,293,000 |  |  |  |
Ending Balance at Sep. 30, 2018 |  | $ 1,418,978 | $ 226,196 | $ 274,748 | (12,610) | $ (76,473) | 1,007,117
Common stock issued: |  |  |  |  |  |  |
Reclassifications of certain income tax effects to retained earnings (2) | [2] |  |  |  | $ (3,276) |  | $ 3,276
[1] | Shares sold through the DRP are issued from treasury stock at average cost, which may differ from the actual market price paid.
[2] | Due to the adoption of ASU No. 2018-02, an amendment to ASC 740, Income Taxes. See Note 2. Summary of Significant Accounting Policies - Recently Adopted Updates to the Accounting Standards Codification section for more details.

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