SIGNIFICANT ACCOUNTING POLICIES - Schedule of PP&E (Details)	12 Months Ended
	Dec. 31, 2019
Freehold buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Fiber optic cable
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Duct
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Fiber optic network equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Fiber optic network equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years