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Debt (Narrative - Corporate Activities) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 18, 2021
USD ($)
shares
May 31, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
item
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Aug. 31, 2016
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                
Additional paid-in capital             $ 1,067,583,000 $ 740,889,000
Retained earnings (deficit)             (5,631,000) 39,375,000
Long-term debt             514,434,000 287,299,000
Loss on extinguishment debt             32,645,000  
Restatement Adjustment [Member]                
Debt Instrument [Line Items]                
Additional paid-in capital               (49,500,000)
Retained earnings (deficit)               11,400,000
Long-term debt               38,100,000
Debt principal offset               39,400,000
Debt issuance costs               $ 1,300,000
Corporate Activities [Member]                
Debt Instrument [Line Items]                
Loss on extinguishment debt             22,100,000  
Unamortized debt issuance costs             $ 1,200,000  
2.25% Convertible Notes Due 2027 [Member] | Corporate Activities [Member] | Convertible Notes [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount     $ 230,000,000.0          
Interest rate, stated percentage     2.25%       2.25%  
Debt Instrument, Maturity Date             Mar. 15, 2027  
Debt instrument convertible rate     31.6206%          
Debt instrument convertible conversion price benchmark     $ 1,000          
Debt conversion price | $ / shares     $ 31.62          
Conversion price percentage     37.50%          
Debt Instrument, Redemption Price, Percentage     100.00%          
Percent of excess of applicable conversion price     140.00%          
Debt Instrument, Convertible, Threshold Trading Days | item     20          
Debt Instrument, Convertible, Threshold Consecutive Trading Days | item     30          
Percent of principal amount, cash price for repurchase     100.00%          
Net proceeds from debt     $ 156,500,000          
4.00% Convertible Notes Due 2024 [Member] | Corporate Activities [Member] | Convertible Notes [Member]                
Debt Instrument [Line Items]                
Debt issuance costs           $ 1,200,000    
Debt instrument, face amount       $ 115,000,000.0        
Interest rate, stated percentage 4.00%     4.00%   4.00% 4.00% 4.00%
Debt Instrument, Maturity Date             Jul. 01, 2024  
Loss on extinguishment debt           $ 9,500,000    
Common stock for conversion, shares | shares 3,568,705 3,568,705   64.1540        
Debt conversion amount $ 51,000,000.0 $ 51,000,000.0            
Debt instrument convertible conversion price benchmark       $ 1,000        
Debt conversion price | $ / shares       $ 15.59        
Debt Conversion, Sale Price Of Common Stock Percent, Minimum       140.00%        
Debt Instrument, Redemption Price, Percentage       100.00%        
4.125% Convertible Notes Due 2022 [Member] | Corporate Activities [Member] | Convertible Notes [Member]                
Debt Instrument [Line Items]                
Debt instrument, face amount         $ 170,000,000.0      
Interest rate, stated percentage         4.125%   4.125% 4.125%
Outstanding amount repurchased     $ 135,700,000          
Debt conversion, principal amounts for integral multiples         $ 1,000      
Common stock for conversion, shares | shares         35.7143      
Debt conversion price | $ / shares         $ 28.00      
Conversion price percentage         140.00%      
Principal amount of notes, percentage         100.00%   100.00%