VEHICLE SERVICE AGREEMENT LIABILITY - Reconciliation of the changes in the vehicle service agreement (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]
Recognition of service fees on vehicle service agreements			$ (5,500)
Vehicle service agreement fees
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at January 1, net	$ 51,723	$ 43,734	43,734
Vehicle service agreement liability acquired during the year related to the purchase of Geminus	0	10,792
Gross service fees for vehicle service agreements sold	4,666	6,055
Recognition of service fees on vehicle service agreements	(5,701)	(5,367)
Liability for claims authorized on vehicle service agreements	2,380	1,887
Payments of claims authorized on vehicle service agreements	(1,475)	(970)
Re-estimation of deferred service fees	(121)	(148)
Balance at March 31, net	$ 51,472	$ 55,983	$ 51,723