REVENUE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consumer Incentives, Expense	$ 11,300	$ 25,000	$ 33,600	$ 47,600
Revenue from Contract with Customer, Excluding Assessed Tax	28,222	48,730	73,731	84,718
Cost per Served Sales [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	20,353	33,549	51,199	54,558
Cost per Redemption [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	7,339	14,276	21,407	28,240
Cost Other [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 530	$ 905	$ 1,125	$ 1,920