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Long-term Debt - 2025 Notes (Details) - 2025 Notes
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2018
USD ($)
shares
$ / shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
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   $ 172,500,000 $ 22,500,000 $ 150,000,000.0
Interest rate 1.50%              
Proceeds from issuance of debt $ 166,600,000              
Debt issuance costs $ 3,400,000              
Interest expense   700,000 $ 1,300,000 700,000 $ 1,300,000      
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   $ 2,400,000 $ 2,100,000 $ 4,800,000 $ 4,300,000      
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