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Debt - Components of Interest Expense Related to Convertible Notes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Total interest expense related to Convertible Notes $ 79,600 $ 58,100 $ 26,100
3.25% Convertible Notes | Convertible Debt      
Debt Instrument [Line Items]      
Cash interest expense (coupon interest expense) 5,994 13,080 13,081
Non-cash amortization of discount on Convertible Notes 4,645 9,717 9,171
Amortization of debt issuance costs 855 1,749 1,600
Total interest expense related to Convertible Notes 11,494 24,546 $ 23,852
1.75% Convertible Notes | Convertible Debt      
Debt Instrument [Line Items]      
Cash interest expense (coupon interest expense) 9,625 9,653  
Non-cash amortization of discount on Convertible Notes 15,338 14,563  
Amortization of debt issuance costs 1,173 1,098  
Total interest expense related to Convertible Notes $ 26,136 $ 25,314