GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	May 09, 2016	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 15, 2017
Finite-Lived Intangible Assets [Line Items]
2019			$ 8,791
2020			7,692
2021			7,118
2022			5,956
Finite-Lived Intangible Assets, Net			35,292	$ 45,401
Gain (Loss) on Disposition of Intangible Assets			0	0	$ 17,149
Proceeds from sale of intangible assets			0	1,500	18,333
Disposition of Intangible Assets, Gross Consideration Received	$ 16,000
Professional Fees			700
Amortization of acquired intangible assets			$ 14,355	$ 14,498	$ 23,032
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life			10 years
OrderUp Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Intangible Assets		$ 17,100
Proceeds from sale of intangible assets		19,800
Disposition of Intangible Assets, Gross Consideration Received		20,000
Professional Fees		$ 200
Other Intangible Assets, Net						$ 2,700