BUSINESS COMBINATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		12 Months Ended
	Sep. 29, 2017	Dec. 31, 2018	Dec. 31, 2017
Angie's List
Business Acquisition [Line Items]
Proportion of voting interests acquired (as a percent)	100.00%
Total purchase price	$ 781,384
Basis of purchase price (shares)	61.3
Share price (USD per share)	$ 12.46
Cash acquisition price	$ 1,900
Cash per share paid to acquiree shareholders who elected payout (USD per share)	$ 8.50
Revenue			$ 58,900
Net earnings (loss)			(21,800)
Modification of Equity Awards
Business Acquisition [Line Items]
Adjustment to increase (decrease) in share-based compensation			77,100
Deferred Revenue Write Off Adjustment
Business Acquisition [Line Items]
Adjustment to decrease in revenues			34,100
Amortization Adjustment
Business Acquisition [Line Items]
Adjustment to decrease in amortization of intangible assets			31,900
One-Time Acquisition-related Costs
Business Acquisition [Line Items]
Severance costs		$ 19,800	28,700
Severance and retention costs			19,800
Write-off due to deferred revenue			$ 7,800