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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property and equipment
Property and equipment	$ 986,790		$ 1,015,379
Accumulated depreciation	(560,340)		(562,986)
Property and equipment held-for-sale, net			885
Total property and equipment, net	426,450		453,278
Accumulated depreciation related to finance leases	1,500		1,600
depreciation and amortization expense
Depreciation expense from property and equipment	23,985	$ 29,307
Amortization expense from finance lease	77	214
Amortization expense from intangible assets	2,993	2,969
Accretion expense from asset retirement obligation	(188)	28
Total depreciation and amortization	26,867	32,518
Property and Equipment Held-for-Sale and Impairments
Net loss on divestitures and sales of property and equipment held-for-sale	(435)	$ 223
Canadian Assets
Property and Equipment Held-for-Sale and Impairments
Net loss on divestitures and sales of property and equipment held-for-sale	100
Land
Property and equipment
Property and equipment	14,213		16,030
Buildings and leasehold improvements
Property and equipment
Property and equipment	98,815		97,426
Vehicles and equipment
Property and equipment
Property and equipment	47,809		53,819
Vehicles and equipment - finance lease
Property and equipment
Property and equipment	1,120		1,291
Machinery and equipment
Property and equipment
Property and equipment	643,551		659,835
Machinery and equipment - finance lease
Property and equipment
Property and equipment	162		162
Computer equipment and software
Property and equipment
Property and equipment	5,960		8,051
Computer equipment and software - finance lease
Property and equipment
Property and equipment	356		356
Pipelines
Property and equipment
Property and equipment	71,821		69,327
Office furniture and equipment
Property and equipment
Property and equipment	1,139		1,157
Disposal wells
Property and equipment
Property and equipment	60,960		64,149
Other
Property and equipment
Property and equipment	497		497
Construction in progress
Property and equipment
Property and equipment	$ 40,387		$ 43,279