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SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]      
Depreciation expense $ 33,618 $ 31,866 $ 28,709
Capital expenditure commitments outstanding 400    
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 483,701 471,200  
Accumulated depreciation (192,147) (163,416)  
Net property and equipment before construction in progress 291,554 307,784  
Capital improvements in progress 48,764 42,882  
Net property and equipment $ 340,318 350,666  
Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Land, land easements and land improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 104,671 107,281  
Land, land easements and land improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 0 years    
Land, land easements and land improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 36,101 34,777  
Buildings | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 20 years    
Buildings | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 216,347 210,872  
Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 19,896 19,393  
Furniture and fixtures | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Furniture and fixtures | Maximum      
Property, Plant and Equipment [Line Items]      
Useful life 10 years    
Other      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 44 44  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 106,642 $ 98,833