FEDERAL INCOME TAX (Federal Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Consolidated federal income tax expense (benefit)	$ (56,809)	$ 2,059	$ (11,405)
Continuing and Discontinuing Operations
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Current	(46,861)	(7,843)	18,493
Deferred	(9,948)	9,902	(21,791)
Consolidated federal income tax expense (benefit)	$ (56,809)	$ 2,059	$ (3,298)