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CONVERTIBLE NOTES - Additional information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 08, 2019
USD ($)
Jun. 12, 2018
USD ($)
Jan. 17, 2018
USD ($)
Mar. 31, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Jun. 28, 2019
$ / shares
Debt Instrument [Line Items]                  
Net proceeds from issuance             $ 729,479,000 $ 896,425,000  
Repayments of debt in cash             $ 493,356,000    
Issuance of common stock upon convertible notes settlement (in shares) | shares             2,158,991    
Closing price of common stock | $ / shares                 $ 118.04
Interest expense                  
Debt issuance costs amortization         $ 645,000 $ 517,000 $ 1,330,000 920,000  
Debt discount amortization         10,075,000 6,171,000 18,468,000 10,822,000  
Loss on settlement of convertible notes             10,558,000    
Coupon interest expense         1,739,000 1,866,000 3,846,000 3,271,000  
Interest Expense, Debt, Total         12,459,000 8,554,000 34,202,000 15,013,000  
Other interest expense         253,000 49,000 500,000 100,000  
Total interest expense         $ 12,712,000 $ 8,603,000 $ 34,702,000 $ 15,113,000  
Convertible Notes                  
Debt Instrument [Line Items]                  
Fixed interest rate (as a percent)     1.00%            
Net proceeds from issuance     $ 671,100,000            
Notes                  
Debt Instrument [Line Items]                  
Amount issued and sold       $ 747,500,000          
Fixed interest rate (as a percent) 0.375%     0.375%          
Net proceeds from issuance $ 729,500,000                
Repurchase price, as percentage of principal amount, if company undergoes change of control             100    
2027 Notes                  
Debt Instrument [Line Items]                  
Repayments of debt in cash       $ 494,000,000.0          
Issuance of common stock upon convertible notes settlement (in shares) | shares       2,200,000          
Value of shares issued to settle notes payable       $ 182,400,000          
Total consideration       676,500,000          
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares)             8.9554    
Conversion price (in dollars per share) | $ / shares         $ 111.66   $ 111.66    
Interest expense amortization term 8 years           7 years 8 months 15 days    
Total transaction costs $ 18,000,000.0                
Transaction costs allocated to liability component $ 11,400,000                
If-converted value of debt in excess of principal amount             $ 42,700,000    
2025 Notes                  
Debt Instrument [Line Items]                  
Repayments of Debt       493,400,000          
Total consideration, allocated to liability component       375,100,000          
Total consideration, allocated to equity component       300,800,000          
Amount used to pay off interest accrued       $ 600,000          
Conversion rate, number of shares to be issued per $1,000 of principal amount (in shares)             13.2569    
Conversion price (in dollars per share) | $ / shares         $ 75.43   $ 75.43    
Interest expense amortization term             5 years 6 months 18 days    
Percentage of closing sales price of entity's common stock that the conversion price must exceed in order for notes to be convertible             130.00%    
Number of days within 30 consecutive trading days in which the closing price of entity's common stock must exceed the conversion price for notes to be convertible into common stock             20    
Number of consecutive trading days during which the closing price of entity's common stock must exceeds the conversion price for at least 20 days in order for the notes to be convertible into common stock             30    
If-converted value of debt in excess of principal amount             $ 234,500,000    
January 2018 Notes                  
Debt Instrument [Line Items]                  
Amount issued and sold     $ 690,000,000.0            
Fixed interest rate (as a percent)     1.00%            
Net proceeds from issuance     $ 671,100,000            
Interest expense amortization term     7 years            
Total transaction costs     $ 18,800,000            
Transaction costs allocated to liability component     $ 13,600,000            
June 2018 Notes                  
Debt Instrument [Line Items]                  
Amount issued and sold   $ 218,500,000              
Fixed interest rate (as a percent)   1.00%              
Net proceeds from issuance   $ 225,300,000              
Interest expense amortization term   6 years 6 months              
Total transaction costs   $ 7,400,000              
Transaction costs allocated to liability component   $ 5,100,000