Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Narrative) (Details)

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INCOME TAXES (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Anticipated change in unrecognized tax benefits      
U.S. tax impact of foreign operations 102.50% 1.00% (53.40%)
Deferred tax assets, valuation allowance $ 20,256,000 $ 24,024,000  
Increase (decrease) in valuation allowance, deferred tax asset (3,800,000)    
Foreign tax and withholding credits 13,300,000 14,572,000  
Net operating losses 7,730,000 13,755,000  
Unrecognized tax benefits that would impact effective tax rate 2,200,000 4,600,000  
Unrecognized tax benefits, income tax penalties and interest accrued 200,000 1,700,000  
Unrecognized tax benefits, income tax penalties and interest expense period increase (decrease) (200,000) 200,000  
Unrecognized tax benefits, increase in period 200,000 900,000 $ 1,400,000
Unrecognized tax benefits, income tax penalties and interest expense 100,000 100,000 300,000
Income tax benefit resulting from lapse of applicable statute of limitations 2,100,000 $ 2,300,000 $ 2,500,000
Commissions and transfer pricing | Minimum      
Anticipated change in unrecognized tax benefits      
Increase in unrecognized tax benefits within the next twelve months 0    
Commissions and transfer pricing | Maximum      
Anticipated change in unrecognized tax benefits      
Increase in unrecognized tax benefits within the next twelve months 100,000    
Audits or the expiration of statutes of limitations in various foreign jurisdictions | Minimum      
Anticipated change in unrecognized tax benefits      
Decrease in unrecognized tax benefits within the next twelve months 0    
Audits or the expiration of statutes of limitations in various foreign jurisdictions | Maximum      
Anticipated change in unrecognized tax benefits      
Decrease in unrecognized tax benefits within the next twelve months 100,000    
Domestic Tax Authority      
Anticipated change in unrecognized tax benefits      
Increase (decrease) in valuation allowance, deferred tax asset (1,300,000)    
Foreign Tax Authority      
Anticipated change in unrecognized tax benefits      
Increase (decrease) in valuation allowance, deferred tax asset (2,500,000)    
Foreign tax and withholding credits $ 12,900,000