INCOME TAXES (Summary of Amounts and Expiration Dates of Operating Loss, Charitable Contribution and Tax Credit Carryforwards) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Capital loss carryforwards - Federal	$ 22,866
Tax credit carryforwards - Historic Tax Credit	630
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration	119,167
Net operating loss carryforwards, not subject to expiration	461,245
Charitable contribution carryforwards - Federal	9,759
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration	348,027
Net operating loss carryforwards, not subject to expiration	$ 176,197