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DEBT (Details - Convertible Senior Notes)
$ / shares in Units, $ in Thousands
6 Months Ended
May 31, 2017
USD ($)
day
$ / shares
Rate
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jul. 24, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]          
Aggregate principal amount of convertible senior notes $ 300,000 $ 299,977     $ 299,991
Annual interest rate on convertible senior notes | Rate 0.625%        
Initial conversion rate, shares per $1,000 principal amount of notes | shares 4.8163        
Initial conversion price per share | $ / shares $ 207.63        
Conversion rate, sales price of common stock as a percentage of the conversion price | Rate 130.00%        
Threshold trading days | day 5        
Threshold consecutive trading days | day 5        
Conversion rate, sales price of common stock as a percentage of the conversion price, five business days | Rate 98.00%        
Cash repurchase at a price equal to the principal amount of the notes, Percentage | Rate 100.00%        
Nonconvertible debt borrowing rate at the date of issuance | Rate 5.36%        
Debt component of the principal amount of the Convertible Senior Notes $ 238,400        
Equity component of the principal amount of the Convertible Senior Notes 61,600        
Financing costs related to the issuance of the Convertible Senior Notes 9,300        
Debt issuance costs, liability component 7,400 3,062     3,811
Debt issuance costs, equity component $ 1,900        
Total interest expense on the Convertible Senior Notes   7,900 $ 7,500    
Interest expense recognized associated with the 0.625% coupon rate   900 900    
Amortization of convertible debt discount   6,250 5,929    
Amortization of debt issuance costs   1,158 970    
Long-term debt   271,378     264,391
Fair value of the Convertible Senior Notes using a Level 1 observable input   430,500      
Unamortized debt discount   25,537     $ 31,789
Convertible Notes Payable [Member]          
Debt Instrument [Line Items]          
Amortization of debt issuance costs   $ 700 $ 700    
Subsequent Event          
Debt Instrument [Line Items]          
Initial conversion rate, shares per $1,000 principal amount of notes | shares       2.1683  
Initial conversion price per share | $ / shares       $ 461.19  
Debt repurchase amount       $ 130,300