INCOME TAXES (Details - Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Deferred tax assets, tax benefit may not be realized	$ 74,400
Deferred tax liabilities goodwill	19,780	$ 17,568
Unrecognized tax benefits	4,629	$ 3,615	$ 3,861	$ 94
Unrecognized tax benefits, tax impact if recognized	3,700
Unrecognized tax benefits, income tax penalties and interest accrued during period	280
Unrecognized tax benefits, income tax penalties and interest accrued	$ 300
U.S. federal corporate tax rate	21.00%
Tax cuts and jobs act, change in tax rate, income tax expense (benefit)	$ 13,600
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	193,700
Operating loss carryforwards, subject to expiration	$ 187,700
Operating loss ending expiration date	Dec. 31, 2037
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	$ 101,200
Operating loss ending expiration date	Dec. 31, 2038
Tax Year 2018 | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	$ 6,000
Raven Holdings | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, subject to expiration	$ 23,500