BUSINESS ACQUISITIONS - Anova Data Narrative (Details) - USD ($) $ in Thousands			3 Months Ended
	Mar. 04, 2020	Jan. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Shares of common stock issued as purchase consideration			$ 110,180		$ 15,186
Goodwill			414,389	$ 224,896	$ 389,196	$ 383,655
Anova Data, Inc.
Business Acquisition [Line Items]
Common stock to be issued (in shares)		2,900,000
Shares of common stock issued as purchase consideration		$ 15,200
Number of additional shares potentially issued (in number of shares)		330,000
Fair value of additional shares potentially issued		$ 1,700
Number of shares issued after post-closing adjustments (in shares)	316,551
Fair value of total consideration			16,900
Finite-lived intangibles			11,200
Weighted average useful life of intangible assets (in years)		6 years 3 months
Net assets acquired			100
Goodwill			$ 5,500