OTHER ASSETS - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deferred Cost and Other Asset [Line Items]
Total definitive-lived intangible, Asset	$ 49,235	$ 45,751
Accumulated Amortization	31,211	24,200
Net	18,024	21,551
Debt issuance costs	3,122	2,466
Debt issuance costs - amortization	405	97
Debt issuance costs - net	2,717	2,369
Prepaid assets - long term	2,009	2,983
Capitalized computer software, gross	34,203	27,876
Capitalized computer software, accumulated amortization	15,930	11,594
Software costs and other - net	18,273	16,282
Total deferred charges and other assets	88,569	79,076
Total Reserve	47,546	35,891
Total Net	41,023	43,185
Deferred contracts
Deferred Cost and Other Asset [Line Items]
Total definitive-lived intangible, Asset	1,362	1,362
Accumulated Amortization	1,263	1,213
Net	99	149
Advertiser lists and customer relationships
Deferred Cost and Other Asset [Line Items]
Total definitive-lived intangible, Asset	31,674	29,281
Accumulated Amortization	20,405	15,399
Net	$ 11,269	13,882
Advertiser lists and customer relationships | Minimum
Deferred Cost and Other Asset [Line Items]
Intangible asset, useful life	3 years
Advertiser lists and customer relationships | Maximum
Deferred Cost and Other Asset [Line Items]
Intangible asset, useful life	5 years
Other definite-lived assets
Deferred Cost and Other Asset [Line Items]
Total definitive-lived intangible, Asset	$ 16,199	15,108
Accumulated Amortization	9,543	7,588
Net	$ 6,656	$ 7,520