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INCOME TAXES (Schedule of Effective Tax Rate Reconciliation) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 35.00% | 35.00%
Increase (decrease) in income taxes resulting from: |  |  |
State income taxes, net of federal tax benefit | (0.40%) | (17.00%) | (0.20%)
Foreign operations | (21.80%) | (112.70%) | (10.00%)
Excess tax benefits from stock compensation | (7.80%) | (57.90%) | (3.90%)
Charitable contributions | (1.20%) | (10.60%) | (0.40%)
Nondeductible meals and entertainment | 1.60% | 8.80% | 0.80%
Domestic production activities deduction | (0.00%) | (0.00%) | (2.60%)
Intercompany profit in inventory | 6.20% | 11.60% | 1.00%
Nondeductible facilitative costs | 0.00% | 22.50% | 0.20%
Changes in valuation allowances | 0.20% | 8.00% | 0.40%
Uncertain tax positions | 0.40% | (4.60%) | (0.30%)
Research and development credit | (2.60%) | (13.20%) | (1.20%)
Return to provision | (2.90%) | (4.30%) | (1.50%)
Reduction of book gain on sale of assets | 0.00% | (4.60%) | 0.00%
Tax reform — Toll Tax | 0.00% | 48.10% | 0.00%
Tax reform — remeasurement of deferred tax assets and liabilities | 0.00% | (378.60%) | 0.00%
Global intangible low-taxed income (GILTI) | 3.50% | 0.00% | 0.00%
Nondeductible executive compensation | 1.60% | 0.00% | 0.00%
Carryback of Federal net operating loss (NOL) | (3.70%) | 0.00% | 0.00%
Other | 0.00% | 0.80% | 0.20%
Effective tax rate | (5.90%) | (468.70%) | 17.50%

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