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INCOME TAXES (Rate Reconciliation) (Details) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation between the effective income tax rate, as computed on income (loss) before income taxes, and the statutory federal income tax rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax provision at the statutory federal rate |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,809 | $ 17,721 | $ 18,052
Federal income tax effects of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (637) | (840) | (992)
Nondeductible expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,344 | 1,682 | 1,551
Life insurance proceeds and changes in cash surrender value |  |  |  |  |  |  |  |  |  |  |  |  | (775) | 7 | (927)
Alternative fuel tax credit |  |  |  |  |  |  |  |  |  |  |  |  | (2,340) | (1,203) |
Net increase (decrease) in valuation allowances |  |  |  |  |  |  |  |  |  |  |  |  | 382 | (891) | 401
Net increase (decrease) in uncertain tax positions |  |  |  |  |  |  |  |  |  |  |  |  | (20) | 933 | (720)
Settlement of share-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 388 | (649) | (1,129)
Impact of the Tax Reform Act on current tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (52) | (1,288)
Impact of the Tax Reform Act on deferred tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,772) | (24,542)
Nonunion pension termination expense |  |  |  |  |  |  |  |  |  |  |  |  | 1,040 |  |
Foreign tax credits generated |  |  |  |  |  |  |  |  |  |  |  |  | (2,054) | (2,216) | (297)
Federal research and development tax credits |  |  |  |  |  |  |  |  |  |  |  |  | (1,354) |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  | (385) | 187 | (1,390)
Federal income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 6,398 | 10,907 | (11,281)
State income tax provision |  |  |  |  |  |  |  |  |  |  |  |  | 3,034 | 4,001 | 2,834
Foreign income tax provision |  |  |  |  |  |  |  |  |  |  |  |  | 2,054 | 2,216 | 297
Total provision (benefit) for income taxes |  |  | $ (6,478) | $ 7,072 | $ 9,184 | $ 1,708 | $ 5,371 | $ 13,215 | $ (499) | $ (963) |  |  | $ 11,486 | $ 17,124 | $ (8,150)
Effective tax (benefit) rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 22.30% | 20.30% | (15.80%)
Statutory federal rate (as a percent) | 32.74% | 35.00% |  |  |  |  |  |  |  |  | 21.00% | 32.74% | 21.00% | 21.00% | 35.00%
Income taxes paid, excluding income tax refunds |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,100 | $ 21,800 | $ 22,700
Income tax refunds |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,100 | $ 18,500 | $ 18,500

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