ACQUISITIONS (Purchase Price and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 02, 2015
Assets Acquired
Goodwill	$ 91,849	$ 91,849	$ 91,849
Cambridge Semiconductor Limited [Member]
Assets Acquired
Cash				$ 1,134
Accounts receivable				1,891
Inventories				1,409
Prepaid expenses and other current assets				408
Tax receivable				1,093
Intangible assets				9,020
Goodwill				11,250
Total assets acquired				26,205
Liabilities Assumed
Current liabilities				1,832
Taxes payable				1,090
Total liabilities assumed				2,922
Total purchase price				23,283
Developed technology | Cambridge Semiconductor Limited [Member]
Assets Acquired
Intangible assets				6,600
Customer relationships [Member] | Cambridge Semiconductor Limited [Member]
Assets Acquired
Intangible assets				$ 2,420