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BUSINESS ACQUISITONS - SCHEDULE OF TAQUA, LLC PURCHASE PRICE ALLOCATION (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 26, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair value of consideration transferred:
Cash, net of cash acquired		$ 46,389	$ 42,951	$ 20,669
Fair value of assets acquired and liabilities assumed:
Goodwill		$ 383,655	$ 335,716	$ 49,393
Taqua, LLC
Fair value of consideration transferred:
Cash, net of cash acquired	$ 19,919
Fair value of assets acquired and liabilities assumed:
Current assets	3,347
Property and equipment	1,478
Goodwill	9,581
Other noncurrent assets	23
Current liabilities	(5,435)
Long-term liabilities	(685)
Assets acquired and liabilities assumed	19,919
Taqua, LLC | Developed technology
Fair value of assets acquired and liabilities assumed:
Intangible assets	2,100
Taqua, LLC | Customer relationships
Fair value of assets acquired and liabilities assumed:
Intangible assets	$ 9,510

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