SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 129,874	$ 116,989
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	2,974	2,982
Buildings
Property, Plant and Equipment [Line Items]
Total property and equipment	85,776	83,360
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	6,058	7,253
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	35,066	23,394
Airplane
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 0