INCOME TAXES (Details - Narrative) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred tax assets, tax benefit may not be realized	$ 216,600
Deferred tax liabilities goodwill	28,457	$ 24,637
Unrecognized tax benefits	5,484	$ 4,320	$ 4,629	$ 3,615
Unrecognized tax benefits, tax impact if recognized	4,400
Unrecognized tax benefits, income tax penalties and interest accrued during period	100
Unrecognized tax benefits, income tax penalties and interest accrued	400
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	251,600
Operating loss carryforwards, subject to expiration	186,200
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	57,900
Tax Year 2018 | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	65,400
Raven Holdings | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, subject to expiration	$ 24,600