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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 14, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period (shares) |  | 85,531,423 |
Balance as of beginning of period |  | $ 1,106,956 |
Net income |  | 48,647 | $ 123,320
Other comprehensive income |  | 3,924 | $ 875
Common stock issued: |  |  |
Incentive plan |  | $ 5,499 |
Dividend reinvestment plan (in shares) | 5,000,000 | 127,000 | 148,000
Dividend reinvestment plan |  | $ 3,805 |
Cash dividend declared ($.24 per share) |  | (20,594) |
Treasury stock and other |  | $ (4,293) |
Balance as of end of period (shares) |  | 85,809,094 |
Balance as of end of period |  | $ 1,143,944 |
Cash dividend declared per share (usd per share) |  | $ 0.24 | $ 0.225
Common Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period (shares) |  | 85,531,000 |
Balance as of beginning of period |  | $ 220,838 |
Common stock issued: |  |  |
Incentive plan (in shares) |  | 286,000 |
Incentive plan |  | $ 717 |
Dividend reinvestment plan (in shares) |  | 127,000 |
Treasury stock and other (shares) |  | (135,000) |
Balance as of end of period (shares) |  | 85,809,000 |
Balance as of end of period |  | $ 221,555 |
Premium on Common Stock [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | 209,931 |
Common stock issued: |  |  |
Incentive plan |  | 4,782 |
Dividend reinvestment plan |  | (1,339) |
Treasury stock and other |  | (23) |
Balance as of end of period |  | 213,351 |
Accumulated Other Comprehensive (Loss) Income [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | (9,394) |
Other comprehensive income |  | 3,924 |
Common stock issued: |  |  |
Balance as of end of period |  | (5,470) |
Treasury Stock And Other [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | (92,164) |
Common stock issued: |  |  |
Dividend reinvestment plan |  | 5,144 |
Treasury stock and other |  | (4,270) |
Balance as of end of period |  | (91,290) |
Retained Earnings [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | 777,745 |
Net income |  | 48,647 |
Common stock issued: |  |  |
Cash dividend declared ($.24 per share) |  | (20,594) |
Balance as of end of period |  | $ 805,798 |

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