INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
U.S. federal corporate income tax rate	21.00%	21.00%	35.00%
State net operating loss carryforwards	$ 67,354	$ 68,436
Income tax receivables	299	922
Interest and penalties recognized as income tax expense (benefit)	(11)	(1,477)	$ 420
Balance of accrued interest and penalties included in liability for unrecognized income tax benefits	301	312	1,789
Unrecognized income tax benefits that would affect the effective tax rate if recognized	5,292	3,481	10,673
Tax Cuts And Jobs Act Of 2017, decrease to net deferred income tax liability	$ 0	0	$ 301,567
Income tax benefit recognition threshold more likely than not	50.00%
Reclassification of stranded tax effects		$ (29,629)
Scenario, Plan [Member]
Operating Loss Carryforwards [Line Items]
U.S. federal corporate income tax rate		21.00%
Alabama [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards	$ 64,778
Alabama [Member] | State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, valuation allowance	$ 29,183
Alabama [Member] | State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration year	2023
Alabama [Member] | State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration year	2032