SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 646,444	$ 527,153
Less: Accumulated depreciation	(136,008)	(111,005)
Property, Plant and Equipment, Net	510,436	416,148
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	35,146	31,437
Land improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 24,372	23,305
Land improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P3Y
Land improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P40Y
Building and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 458,111	364,561
Building and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P3Y
Building and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P40Y
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 104,245	87,503
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P3Y
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P10Y
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 22,764	18,715
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P3Y
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	P10Y
Construction in process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,806	$ 1,632