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Convertible Senior Notes, Net (Details)
3 Months Ended 7 Months Ended 12 Months Ended
Mar. 15, 2019
USD ($)
Aug. 02, 2018
USD ($)
shares
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Mar. 15, 2019
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
offering
Dec. 31, 2014
USD ($)
offering
Debt Instrument [Line Items]                    
Proceeds from issuance of convertible senior notes           $ 0 $ 0 $ 226,550,000    
Cash payment for debt redemption           0 704,000 40,461,000    
Loss on early extinguishment of debt           $ 0 0 (2,573,000)    
Conversions of convertible senior notes for common stock             $ 33,778,000 $ 108,000    
Common Stock                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock (in shares) | shares             1,967,361 10,828,475    
Conversions of convertible senior notes for common stock             $ 20,000 $ 108,000    
Share price (in dollars per share) | $ / shares           $ 11.17        
Additional Paid-In-Capital                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock             33,758,000 0    
Convertible Debt                    
Debt Instrument [Line Items]                    
Debt instrument, face amount           $ 575,000,000        
Interest expense           28,800,000 29,100,000 28,200,000    
Non-cash interest expense           6,000,000.0 $ 6,000,000.0 7,100,000    
Convertible Debt | 2019 and 2022 Notes | Additional Paid-In-Capital                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock           15,400,000        
Convertible Debt | 2019 Notes                    
Debt Instrument [Line Items]                    
Number of debt offerings issued | offering                   2
Debt instrument, face amount                   $ 254,800,000
Stated interest rate                   5.50%
Proceeds from issuance of convertible senior notes                   $ 248,600,000
Principal amount redeemed   $ 206,200,000     $ 47,900,000          
Cash payment for debt redemption $ 700,000 $ 39,300,000     $ 200,000          
Loss on early extinguishment of debt               $ 2,600,000    
Convertible Debt | 2019 Notes | Common Stock                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock (in shares) | shares   10,020,328 1,967,361   2,775,509     10,828,475    
Conversions of convertible senior notes for common stock     $ 33,800,000              
Convertible Debt | 2019 Notes | Additional Paid-In-Capital                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock   $ 166,000,000.0     $ 13,900,000          
Convertible Debt | 2022 Notes                    
Debt Instrument [Line Items]                    
Number of debt offerings issued | offering                 2  
Debt instrument, face amount           $ 345,000,000     $ 345,000,000.0  
Stated interest rate           4.75%     4.75%  
Proceeds from issuance of convertible senior notes                 $ 337,500,000  
Convertible senior notes, net           $ 340,400,000        
Unamortized discount           4,600,000        
Convertible Debt | 2022 Notes | Additional Paid-In-Capital                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock           11,000,000.0        
Convertible Debt | 2023 Notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount       $ 230,000,000.0   $ 230,000,000   $ 230,000,000.0    
Stated interest rate       5.375%   5.38%   5.375%    
Proceeds from issuance of convertible senior notes       $ 223,700,000            
Convertible senior notes, net           $ 225,300,000        
Unamortized discount           4,700,000        
Convertible Debt | 2023 Notes | Additional Paid-In-Capital                    
Debt Instrument [Line Items]                    
Conversions of convertible senior notes for common stock           $ 4,400,000