RELATED PARTY TRANSACTIONS (Details) $ in Thousands				3 Months Ended		15 Months Ended
	Nov. 17, 2015 USD ($)	Aug. 28, 2015 ft² a item	Sep. 30, 2004 USD ($)	Mar. 31, 2020 USD ($) ft²	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)
RELATED PARTY TRANSACTIONS
Right of use asset				$ 15,369		$ 15,369	$ 15,574
Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
RELATED PARTY TRANSACTIONS
Rent paid				174	$ 174
Operating expenses related to lease				7	12
Right of use asset				10,700		10,700
Operating lease liability				$ 10,700		$ 10,700
Biggest Little Investments, L.P. (BLI) | Driveway Lease
RELATED PARTY TRANSACTIONS
Lease term			15 years
Area of property | ft²				37,400		37,400
Minimum annual rent			$ 300
Anniversary years subject to cost of living adjustment rent increases			5 years
Number of terms for which the lease can be renewed | item		3
Lease renewal option additional term		5 years
Rent paid				$ 101	94
Operating expenses related to lease				8	$ 9
Right of use asset				4,100		$ 4,100
Operating lease liability				$ 4,100		4,100
Affiliates | Billboard advertising, storage space and parking lot space
RELATED PARTY TRANSACTIONS
Rent paid						$ 36
Golden Road | Parking Lot Lease | Buildings
RELATED PARTY TRANSACTIONS
Area of land | a		4.2
Golden Road | Parking Lot Lease | Land
RELATED PARTY TRANSACTIONS
Number of parking spaces | item		300
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease
RELATED PARTY TRANSACTIONS
Lease term		20 years
Minimum annual rent	$ 695
Anniversary years subject to cost of living adjustment rent increases	5 years
Lease renewal option additional term				10 years		10 years
Lessee, Operating Lease, Existence of Option to Extend [true false]				true
Amount due to related party if lease is not renewed				$ 1,600		$ 1,600
Golden Road | Biggest Little Investments, L.P. (BLI) | Parking Lot Lease | Buildings
RELATED PARTY TRANSACTIONS
Area of property | ft²		46,000
Area of land | a		4.2