NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Restricted Cash) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and Cash Equivalents	$ 9,970	$ 60,960	$ 10,000
Total Cash, Cash Equivalents, and Restricted Cash	33,489	82,003	28,472	$ 152,747
Investments and Other Property
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	20,000	19,000	16,000
Current Assets—Other
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted Cash	$ 3,000	$ 2,000	$ 2,000