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INCOME TAXES, Reconciliation of Income taxes Computed at the Statutory Federal Income Tax Rate to Provision for Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
INCOME TAXES [Abstract] |  |  |  |  |  |  |  |  |  |  |
Additions or reductions to gross unrecognized tax benefits |  |  |  |  |  |  |  |  | $ 0 |  |
Reconciliation of income taxes to the statutory rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  |  |  |  |  |  |  | 21.00% | 31.50% | 35.00%
Income tax expense computed at the U.S. statutory federal rate |  |  |  |  |  |  |  |  | $ 18,139 | $ 26,505 | $ 30,134
Effect of federal reduction of statutory rate |  |  |  |  |  |  |  |  | 0 | (1,654) | 0
State income tax expense - net of federal benefit |  |  |  |  |  |  |  |  | 4,795 | 3,842 | 4,193
Non-deductible executive compensation |  |  |  |  |  |  |  |  | 630 | 658 | 512
Other |  |  |  |  |  |  |  |  | (526) | (582) | 717
Provision for income taxes | $ 4,974 | $ 5,880 | $ 6,889 | $ 5,295 | $ 9,270 | $ 678 | $ 11,466 | $ 7,355 | $ 23,038 | $ 28,769 | $ 35,556
Effective income tax rate |  |  |  |  |  |  |  |  | 26.70% | 34.30% | 41.30%

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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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