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Debt - Convertible Senior Notes Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Amortization of debt discounts       $ 5,309,000 $ 4,077,000    
Debt instrument, percentage of repurchase price to principal amount if company undergoes fundamental change 100.00% 100.00%   100.00%      
Debt instrument, event of default minimum percentage of principal amount 25.00% 25.00%   25.00%      
Debt instrument, percentage of repurchase price to principal amount if company defaults 100.00% 100.00%   100.00%      
Stock Issued During Period, Value, Conversion of Convertible Securities   $ 198,502,000   $ 198,508,000      
Debt Instrument, Redemption, Period One [Member]              
Debt Instrument [Line Items]              
Debt instrument, convertible conversion price (in dollars per share) | $ / shares $ 22.74 $ 22.74   $ 22.74      
2022 Convertible Notes | Debt Instrument, Redemption, Period One [Member]              
Debt Instrument [Line Items]              
Convertible senior notes amount $ 146,491,000 $ 146,491,000   $ 146,491,000   $ 345,000,000 $ 345,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.50% 3.50%   3.50%     3.50%
Debt instrument, convertible, conversion ratio       0.0439448      
Debt Instrument, Principal Amount Used For Conversion $ 1,000 $ 1,000   $ 1,000      
Amortization of debt discounts   $ 3,843,000 $ 4,311,000 $ 12,531,000 $ 12,869,000    
Debt Instrument, Convertible, If-converted Value in Excess of Principal $ 100,467,000            
Share Price | $ / shares $ 38.33 $ 38.33   $ 38.33      
Stock Issued During Period, Value, Conversion of Convertible Securities   $ 198,503,000   $ 198,509,000