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Income Taxes (Details 4) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Reasons for consolidated income tax provision |  |  |
Effective income tax rate (as percent) | 28.60% | 35.00% | 35.00%
Income tax (benefit) expense at statutory tax rate of 28.6%, 35.0% and 35.0%, respectively | $ 2,136 | $ 3,447 | $ (1,139)
Effect of graduated tax rates | 0 | (98) | 33
State income taxes, net of Federal tax benefit | 120 | (22) | (215)
Impact of Non US operations | (288) | 403 | (162)
Research and development tax credit | (951) | (403) | (499)
Impact of tax reform | 10,912 | 0 | 0
Meals and entertainment | 242 | 266 | 329
Nondeductible interest on contingent payments | 0 | 174 | 262
Nontaxable gain on revaluation of contingent consideration liability | 0 | (5,576) | (170)
Change in valuation allowance | (21,741) | 6,139 | 40,685
Effect of elimination of stock compensation APIC pool | 0 | 1,380 | 739
Nondeductible stock-based compensation | 0 | (1,224) | 0
Other | 700 | 353 | 474
Income tax (benefit) expense | $ (8,870) | $ 4,839 | $ 40,337

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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to the impact of non US operations. + References No definition available. + Details
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