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Long-term Debt - 2025 Notes (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2018
USD ($)
shares
$ / shares
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Oct. 24, 2018
USD ($)
Oct. 22, 2018
USD ($)
Debt Instrument [Line Items]                        
Stockholders' equity   $ (613,088,000) $ (614,190,000) $ (613,088,000) $ (614,190,000) $ (611,209,000)   $ (693,633,000) $ (617,298,000) $ (619,600,000)    
Amortization of deferred financing costs       1,079,000 8,837,000              
Cumulative Effect, Period of Adoption, Adjustment                        
Debt Instrument [Line Items]                        
Stockholders' equity               66,383,000        
Common Stock                        
Debt Instrument [Line Items]                        
Stockholders' equity   (916,000) (872,000) (916,000) (872,000) (916,000)   (908,000) (868,000) (859,000)    
Additional Paid-In Capital                        
Debt Instrument [Line Items]                        
Stockholders' equity   (1,231,005,000) (1,242,900,000) (1,231,005,000) (1,242,900,000) (1,224,250,000)   (1,340,989,000) (1,236,847,000) (1,229,320,000)    
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment                        
Debt Instrument [Line Items]                        
Stockholders' equity               106,172,000        
Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Stockholders' equity             $ (106,200,000)          
Retained Earnings (Accumulated Deficit)                        
Debt Instrument [Line Items]                        
Stockholders' equity   596,928,000 608,092,000 596,928,000 608,092,000 $ 592,340,000   626,779,000 $ 598,985,000 $ 589,178,000    
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment                        
Debt Instrument [Line Items]                        
Stockholders' equity               (39,789,000)        
Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Stockholders' equity             (39,800,000)          
2025 Notes                        
Debt Instrument [Line Items]                        
Debt issuance costs $ 5,900,000                      
Senior Notes | 2025 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
Interest rate 1.50%                      
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                      
Proceeds from issuance of debt 166,600,000                      
Debt issuance costs $ 3,400,000                      
Amortization of deferred financing costs   $ 300,000 $ 2,400,000 $ 600,000 $ 4,800,000              
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 | 2025 Notes | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Carrying amount             41,300,000          
Senior Notes | 2025 Notes | Common Stock                        
Debt Instrument [Line Items]                        
Proceeds from issuance of debt $ 71,800,000                      
Debt issuance costs $ 2,500,000                      
Senior Notes | 2025 Notes | Common Stock | Class A Common Stock                        
Debt Instrument [Line Items]                        
Initial conversion rate per $ 1000 principal amount 0.0299135                      
Senior Notes | 2025 Notes | Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Equity Component of Long Term Debt                        
Debt Instrument [Line Items]                        
Stockholders' equity             71,800,000          
Senior Notes | 2025 Notes | Additional Paid-In Capital | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06 | Deferred Financing Fees                        
Debt Instrument [Line Items]                        
Stockholders' equity             (2,500,000)          
Senior Notes | 2025 Notes | Retained Earnings (Accumulated Deficit) | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                        
Debt Instrument [Line Items]                        
Stockholders' equity             $ 28,100,000