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INCOME TAXES (Schedule of Effective Tax Rate Reconciliation) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) in income taxes resulting from: |  |  |
State income taxes, net of federal tax benefit | (17.00%) | (0.20%) | 1.30%
Foreign operations | (112.70%) | (10.00%) | (12.50%)
Spine valuation allowance | 0.00% | 0.00% | 61.10%
Excess tax benefits from stock compensation | (57.90%) | (3.90%) | 0.00%
Charitable contributions | (10.60%) | (0.40%) | (1.00%)
Nondeductible meals and entertainment | 8.80% | 0.80% | 0.90%
Domestic production activities deduction | (0.00%) | (2.60%) | (2.40%)
Intercompany profit in inventory | 11.60% | 1.00% | 3.10%
Nondeductible facilitative costs | 22.50% | 0.20% | 3.10%
Changes in valuation allowances | 8.00% | 0.40% | 0.30%
Uncertain tax positions | (4.60%) | (0.30%) | 0.20%
Research and development credit | (13.20%) | (1.20%) | (1.90%)
Return to provision | (4.30%) | (1.50%) | 1.70%
Reduction of book gain on sale of assets | (4.60%) | 0.00% | 0.00%
Tax reform — Toll Tax | 48.10% | 0.00% | 0.00%
Tax reform — remeasurement of deferred tax assets and liabilities | (378.60%) | 0.00% | 0.00%
Other | 0.80% | 0.20% | (0.20%)
Effective tax rate | (468.70%) | 17.50% | 88.70%

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