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INCOME TAXES (Schedule of Effective Tax Rate Reconciliation) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | (0.20%) | 1.30% | 5.60%
Foreign operations | (10.00%) | (12.50%) | (16.70%)
Spine valuation allowance | 0.00% | 61.10% | 0.00%
Excess tax benefits from stock compensation | (3.90%) | 0.00% | 0.00%
Charitable contributions | (0.40%) | (1.00%) | (2.70%)
Domestic production activities deduction | (2.60%) | (2.40%) | (2.70%)
Intercompany profit in inventory | 1.00% | 3.10% | (0.40%)
Nondeductible facilitative costs | 0.20% | 3.10% | 1.10%
Changes in valuation allowances | 0.40% | 0.30% | 2.10%
Uncertain tax positions | (0.30%) | 0.20% | (3.40%)
Research and development credit | (1.20%) | (1.90%) | (1.80%)
Return to provision | (1.50%) | 1.70% | 1.40%
Other | 1.00% | 0.70% | 2.80%
Effective tax rate | 17.50% | 88.70% | 20.30%

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