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DEBT - Convertible Senior Notes Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 29, 2020
USD ($)
day
$ / shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                        
Redemption percentage 100.00%                      
Convertible senior notes, net   $ 589,769,000   $ 589,769,000         $ 518,203,000      
Impact of ASU adoption   459,632,000 $ 529,322,000 459,632,000 $ 529,322,000 $ 522,468,000 $ 478,925,000   542,172,000 $ 556,282,000 $ 566,611,000 $ 539,010,000
Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Convertible senior notes, net               $ 587,700,000        
Retained Earnings                        
Debt Instrument [Line Items]                        
Impact of ASU adoption   $ 316,150,000 $ 338,300,000 $ 316,150,000 $ 338,300,000 $ 375,069,000 $ 340,223,000   339,879,000 $ 359,989,000 $ 383,142,000 $ 410,919,000
Cumulative Effect, Period of Adoption, Adjustment                        
Debt Instrument [Line Items]                        
Impact of ASU adoption                 (52,205,000)      
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Convertible senior notes, net               $ 69,500,000        
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings                        
Debt Instrument [Line Items]                        
Impact of ASU adoption                 9,399,000      
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Impact of ASU adoption                 $ 9,400,000      
On or after March 1, 2023                        
Debt Instrument [Line Items]                        
Redemption percentage 100.00%                      
Convertible debt                        
Debt Instrument [Line Items]                        
Face amount $ 600,000,000                      
Interest rate 0.75% 0.75% 0.75% 0.75% 0.75%              
Initial conversion rate 7.4045                      
Debt conversion amount $ 1,000                      
Initial conversion price (in dollars per share) | $ / shares $ 135.05                      
Convertible debt | After the calendar quarter ending on June 30, 2020                        
Debt Instrument [Line Items]                        
Threshold percentage of stock price trigger 130.00%                      
Threshold trading days | day 20                      
Threshold consecutive trading days | day 30                      
Convertible debt | Measurement period                        
Debt Instrument [Line Items]                        
Threshold percentage of stock price trigger 98.00%                      
Threshold consecutive trading days | day 5                      
Threshold consecutive business days | day 5                      
Convertible debt | On or after March 1, 2023                        
Debt Instrument [Line Items]                        
Threshold percentage of stock price trigger 130.00%                      
Threshold trading days | day 20                      
Threshold consecutive trading days | day 30