INCOME TAXES (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
U.S. federal corporate income tax rate	21.00%		35.00%
Tax Cuts and Jobs Act of 2017, percent of immediate deductibility of certain capital investments	100.00%
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional expense, deferred tax assets, executive compensation			$ 1,403,000
Income tax benefit	$ (4,903,000)	$ (3,175,000)
Tax Cuts and Jobs Act of 2017, incomplete accounting, provisional transition tax, foreign repatriation			$ 12,301,000
Forecast [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards				$ 71,159,000
Net operating loss carryforwards, valuation allowance				29,695,000
Alabama [Member] | State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration date	Dec. 31, 2023
Alabama [Member] | State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration date	Dec. 31, 2033
Alabama [Member] | Forecast [Member]
Operating Loss Carryforwards [Line Items]
State net operating loss carryforwards				67,546,000
Net operating loss carryforwards, valuation allowance				$ 29,182,000