INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets:
Doubtful accounts	$ 2,426	$ 1,507
Inventory related items	39,548	28,245
Tax credits	19,134	9,072
Accrued vacation	3,206	2,761
Accrued bonus	6,017	5,515
Stock compensation	8,347	10,093
Deferred revenue	1,805	2,173
Net operating loss carryforwards	37,418	33,350
Capitalization of research and development expenses	9,781	0
Unrealized foreign exchange loss	8,105	1,405
Charitable contributions carryforward	235	1,994
Others	5,900	8,835
Total deferred tax assets	141,922	104,950	$ 96,500
Less valuation allowance	(9,865)	(6,973)	$ (8,000)
Deferred tax assets after valuation allowance	132,057	97,977
Liabilities:
Intangible and fixed assets	(150,879)	(144,861)
Others	(5,108)	(4,089)
Total deferred tax liabilities	(155,987)	(148,950)
Total net deferred tax liabilities	$ (23,930)	$ (50,973)