ACQUISITIONS: Components of intangible assets acquired and their estimated useful lives as of the acquisition date (Details) - Data Plus Math Corporation $ in Thousands	Jul. 02, 2019 USD ($)
Business Acquisition [Line Items]
Intangible assets	$ 34,000
Acquired developed technology
Business Acquisition [Line Items]
Intangible assets	$ 11,000
Amortization period	4 years
Data supply relationships
Business Acquisition [Line Items]
Intangible assets	$ 16,000
Amortization period	4 years
Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 6,000
Amortization period	4 years
Trademarks
Business Acquisition [Line Items]
Intangible assets	$ 1,000
Amortization period	2 years