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 (Other assets)	$ 35,000
Acquired developed technology
Business Acquisition [Line Items]
Intangible assets (Other assets)	$ 23,000
Amortization period	4 years
Data supply relationships
Business Acquisition [Line Items]
Intangible assets (Other assets)	$ 7,000
Amortization period	4 years
Customer relationships
Business Acquisition [Line Items]
Intangible assets (Other assets)	$ 4,000
Amortization period	4 years
Trademarks
Business Acquisition [Line Items]
Intangible assets (Other assets)	$ 1,000
Amortization period	2 years