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Long-Term Obligations and Commitments, Convertible Debt and Call Spread (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2021
Apr. 30, 2021
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Nov. 30, 2014
Convertible Debt [Abstract]                
Repurchase of convertible notes       $ 61,967 $ 0 $ 0    
Unamortized debt issuance costs       20,302        
Cost of call spread   $ 46,900 $ 52,600          
Purchase of note hedges   136,700 108,700 136,620 0 108,684    
Proceeds from issuance of warrants   89,800 $ 56,100 89,752 0 56,110    
Loss on early retirement of debt       (8,627) 0 (66,196)    
Amortization of debt discount and debt issuance costs       4,900 $ 3,200 $ 2,900    
0% Notes [Member]                
Convertible Debt [Abstract]                
Face amount of offering   $ 632,500            
Outstanding principal balance       632,500        
Unamortized debt issuance costs       $ 13,400        
Maturity date       Apr. 30, 2026        
Interest rate   0.00% 0.00% 0.00%   0.00%    
Effective interest rate       0.50%        
Conversion price per share (in dollars per share)       $ 57.84        
Effective conversion price per share with call spread (in dollars per share)       $ 76.39        
Total shares of common stock subject to conversion (in shares)       10.9        
Percentage of principal amount used as purchase price upon occurrence of fundamental change       100.00%        
0.125% Notes [Member]                
Convertible Debt [Abstract]                
Outstanding principal balance       $ 548,800        
Unamortized debt issuance costs       $ 6,500        
Maturity date       Dec. 31, 2024        
Interest rate     0.125% 0.125% 0.125% 0.125%    
Effective interest rate       0.50%        
Conversion price per share (in dollars per share)       $ 83.28        
Effective conversion price per share with call spread (in dollars per share)       $ 123.38        
Total shares of common stock subject to conversion (in shares)       6.6        
Percentage of principal amount used as purchase price upon occurrence of fundamental change       100.00%        
0.125% Convertible Senior Notes Issued in Exchange for 1 Percent Notes [Member]                
Convertible Debt [Abstract]                
Face amount of offering     $ 439,300     $ 439,300    
0.125% Convertible Senior Notes Issued under Subscription Agreements [Member]                
Convertible Debt [Abstract]                
Face amount of offering     109,500     109,500    
1% Notes [Member]                
Convertible Debt [Abstract]                
Face amount of offering             $ 185,500 $ 500,000
Principal amount repurchased   $ 247,900 375,600 $ 247,900   375,600    
Repurchase of convertible notes $ 62,000 $ 257,000            
Outstanding principal balance     $ 309,900     $ 309,900    
Interest rate 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%
Effective interest rate       1.40%        
Loss on early retirement of debt   $ 8,600 $ (66,200)          
Percentage of principal amount used as purchase price upon occurrence of fundamental change       100.00%        
2.75% Convertible Senior Notes [Member]                
Convertible Debt [Abstract]                
Interest rate             2.75%