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PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property and equipment          
Property and equipment $ 1,069,496   $ 1,069,496   $ 1,114,378
Property, Plant and Equipment, Net 468,211   468,211   502,848
Accumulated depreciation (603,191)   (603,191)   (611,530)
Property and equipment held-for-sale 1,906   1,906    
Total property and equipment, net 468,211   468,211   502,848
Accumulated depreciation related to finance leases 1,700   1,700    
Depreciation 26,800 $ 27,900 56,300 $ 55,400  
Property and Equipment Held-for-Sale and Impairments          
Impairment of property and equipment     893 2,282  
Net loss on divestitures and sales of property and equipment held-for-sale     (2,794) 1,503  
Canadian Business          
Property and Equipment Held-for-Sale and Impairments          
Impairment of property and equipment     900    
Net loss on divestitures and sales of property and equipment held-for-sale     2,800    
Land          
Property and equipment          
Property and equipment 16,030   16,030   17,799
Buildings and leasehold improvements          
Property and equipment          
Property and equipment 105,220   105,220   106,626
Vehicles and equipment          
Property and equipment          
Property and equipment 62,046   62,046   83,435
Vehicles and equipment - finance lease          
Property and equipment          
Property and equipment 1,599   1,599   1,833
Machinery and equipment          
Property and equipment          
Property and equipment 724,500   724,500   758,528
Machinery and equipment - finance lease          
Property and equipment          
Property and equipment 202   202   532
Computer equipment and software          
Property and equipment          
Property and equipment 17,044   17,044   15,775
Computer equipment and software - finance lease          
Property and equipment          
Property and equipment 356   356   356
Office furniture and equipment          
Property and equipment          
Property and equipment 4,614   4,614   4,612
Disposal wells          
Property and equipment          
Property and equipment 64,321   64,321   64,038
Other          
Property and equipment          
Property and equipment 497   497   497
Construction in progress          
Property and equipment          
Property and equipment 73,067   73,067   $ 60,347
Finance leased assets          
Property and equipment          
Depreciation $ 500 $ 300 $ 700 $ 700