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COMMON STOCK EQUITY - CHANGE IN COMMON STOCK EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period (shares) |  | 86,086,355 |
Balance as of beginning of period |  | $ 1,166,591 |
Net income |  | 34,929 | $ 50,282
Other comprehensive income |  | 5,832 | $ 3,924
Common stock issued: |  |  |
Incentive plan |  | $ 4,278 |
Dividend reinvestment plan (in shares) | 5,000,000 | 139,000 | 127,000
Dividend reinvestment plan |  | $ 4,619 |
Cash dividend declared ($.255 per share) |  | (21,980) |
Treasury stock and other |  | $ (8,908) |
Balance as of end of period (shares) |  | 86,196,239 |
Balance as of end of period |  | $ 1,185,361 |
Cash dividend declared per share (usd per share) |  | $ 0.255 | $ 0.24
Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period (shares) |  | 86,086,000 |
Balance as of beginning of period |  | $ 221,654 |
Common stock issued: |  |  |
Incentive plan (in shares) |  | 200,000 |
Incentive plan |  | $ 499 |
Dividend reinvestment plan (in shares) |  | 139,000 |
Treasury stock and other (shares) |  | (229,000) |
Balance as of end of period (shares) |  | 86,196,000 |
Balance as of end of period |  | $ 222,153 |
Premium on Common Stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | 215,580 |
Common stock issued: |  |  |
Incentive plan |  | 3,779 |
Dividend reinvestment plan |  | (883) |
Treasury stock and other |  | 0 |
Balance as of end of period |  | 218,476 |
Accumulated Other Comprehensive (Loss) Income |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | (15,155) | $ (9,394)
Other comprehensive income |  | 5,832 | 3,924
Common stock issued: |  |  |
Balance as of end of period | $ (5,470) | (9,323) | $ (5,470)
Treasury Stock And Other |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | (81,044) |
Common stock issued: |  |  |
Dividend reinvestment plan |  | 5,502 |
Treasury stock and other |  | (8,908) |
Balance as of end of period |  | (84,450) |
Retained Earnings |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance as of beginning of period |  | 825,556 |
Net income |  | 34,929 |
Common stock issued: |  |  |
Cash dividend declared ($.255 per share) |  | (21,980) |
Balance as of end of period |  | $ 838,505 |

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