IMPAIRMENT CHARGES (Details) - USD ($)	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 442,819,000		$ 486,930,000
Canada
Property, Plant and Equipment [Line Items]
Goodwill, impairment loss		$ 0
Australia
Property, Plant and Equipment [Line Items]
Impairment expense of long-lived assets	7,900,000
Property, plant and equipment, net	$ 2,400,000
Canada
Property, Plant and Equipment [Line Items]
Impairment expense of long-lived assets		38,100,000
Property, plant and equipment, net		43,500,000
Canada | Canada
Property, Plant and Equipment [Line Items]
Impairment expense of long-lived assets		93,600,000
U.S.
Property, Plant and Equipment [Line Items]
Impairment expense of long-lived assets		12,400,000
Property, plant and equipment, net		$ 12,500,000