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%