INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Income tax benefit recognition threshold more likely than not				50.00%
Retained earnings	$ 3,049,943		$ 2,623,747	$ 3,049,943	$ 2,623,747		$ 2,895,871
Income tax expense	$ 61,352		$ 47,598	$ 73,546	$ 58,291
Cash tax benefit		$ 13,301
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
Alabama [Member] | Forecast [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards						$ 63,380
Net operating loss carryforwards, valuation allowance						$ 29,236