SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 116,989	$ 97,194
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	2,982	8,396
Buildings
Property, Plant and Equipment [Line Items]
Total property and equipment	83,360	69,214
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	7,253	5,733
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	23,394	13,851
Airplane
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 0