FEDERAL INCOME TAX (Federal Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Consolidated federal income tax expense (benefit)	$ (11,405)	$ (29,220)	$ 8,379
Continuing and Discontinuing Operations
Reconciliation Of Consolidated Federal Income Tax Expense (Benefit) [Line Items]
Current	18,493	1,989	3,239
Deferred	(21,791)	(26,719)	5,524
Consolidated federal income tax expense (benefit)	$ (3,298)	$ (24,730)	$ 8,763