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Long-term Debt - 2025 Notes (Details) - 2025 Notes
$ / shares in Units, shares in Millions
 1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 24, 2018
USD ($)
Oct. 22, 2018
USD ($)
Debt Instrument [Line Items]            
Debt issuance costs $ 5,900,000          
Senior Notes            
Debt Instrument [Line Items]            
Face amount $ 172,500,000 $ 172,500,000 $ 172,500,000   $ 22,500,000 $ 150,000,000
Interest rate 1.50%          
Proceeds from issuance of debt $ 166,600,000          
Debt issuance costs $ 3,400,000          
Interest expense   2,600,000 2,600,000 $ 2,600,000    
Conversion price (in dollars per share) | $ / shares $ 33.43          
Initial conversion amount (in shares) | shares 5.2          
Carrying amount $ 100,700,000          
Non-cash amortization of debt discount and debt issuance costs   $ 10,000,000 $ 9,200,000 $ 8,500,000    
Repurchase covenant, repurchase price due to fundamental change as percentage of principal amount 100.00%          
Repurchase covenant, sale price as a percentage of conversion price (at least) 130.00%          
Repurchase covenant, trading days, minimum 20 days          
Repurchase covenant, consecutive trading days, minimum 30 days          
Repurchase covenant, repurchase price due to change in sale price as percentage of conversion price 100.00%          
Senior Notes | Common Stock            
Debt Instrument [Line Items]            
Proceeds from issuance of debt $ 71,800,000          
Debt issuance costs $ 2,500,000          
Senior Notes | Class A Common Stock | Common Stock            
Debt Instrument [Line Items]            
Initial conversion rate per $ 1000 principal amount 0.0299135