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Long-term Debt - 2021 Notes (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2020 USD ($) shares $ / shares | Dec. 31, 2016 USD ($) shares $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  | $ 13,399,000 | $ 10,093,000 |  |
Repayments of senior debt |  |  |  |  | 0 | 16,388,000 |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Payments of debt issuance costs | $ 2,500,000 |  |  |  |  |  |  |
Net loss on extinguishment of debt, including fees paid to lenders | 4,800,000 |  |  |  |  |  |  |
Senior Notes | 2021 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 125,000,000 | $ 26,737,000 |  | 26,737,000 |  | $ 26,737,000 |
Interest rate |  | 2.00% |  |  |  |  |  | 2.00%
Proceeds from issuance of debt |  | $ 120,400,000 |  |  |  |  |  |
Debt issuance costs |  | $ 4,600,000 |  |  |  |  |  |
Repurchase covenant, repurchase price due to fundamental change as percentage of principal amount |  | 100.00% |  |  |  |  |  |
Interest expense |  |  | 100,000 | $ 300,000 | 400,000 | 1,500,000 |  |
Amortization of deferred financing costs |  |  | 100,000 | $ 100,000 | 200,000 | $ 600,000 |  |
Debt conversion, original debt, amount | 84,200,000 |  |  |  |  |  |  |
Face amount of debt repaid | 14,000,000 |  |  |  |  |  |  |
Repayments of senior debt | 13,900,000 |  |  |  |  |  |  |
Senior Notes | 2021 Notes | Class A Common Stock | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate per $ 1000 principal amount |  | 0.0416082 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 24.03 |  |  |  |  |  |
Initial conversion amount (in shares) | shares |  | 5.2 |  |  |  |  |  |
Senior Notes | 2024 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | $ 117,100,000 |  | 117,051,000 |  | 117,051,000 |  | $ 117,051,000 |
Interest rate | 3.50% |  |  |  |  |  |  |
Debt issuance costs | $ 3,000,000 |  |  |  |  |  |  |
Repurchase covenant, repurchase price due to fundamental change as percentage of principal amount | 100.00% |  |  |  |  |  |  |
Interest expense |  |  | $ 1,000,000.0 |  | $ 3,000,000 |  |  |
Conversion price (in dollars per share) | $ / shares | $ 18.23 |  |  |  |  |  |  |
Initial conversion amount (in shares) | shares | 6.4 |  |  |  |  |  |  |
Debt conversion, converted instrument, amount | $ 84,200,000 |  |  |  |  |  |  |
Senior Notes | 2024 Notes | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt | 38,100,000 |  |  |  |  |  |  |
Debt issuance costs | $ 1,300,000 |  |  |  |  |  |  |
Senior Notes | 2024 Notes | Class A Common Stock | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate per $ 1000 principal amount | 0.0548667 |  |  |  |  |  |  |

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