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Long-term Debt - Credit Agreement (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 08, 2021 | Dec. 30, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on repayment of debt, net |  |  | $ 0 | $ (4,789,000) | $ 0 | $ (4,789,000) |  |
Initial Term Loan Facility | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  | $ 75,000,000 |  |  |  |  |  |
Credit Agreement | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on repayment of debt, net | $ 19,200,000 |  |  |  |  |  |  |
Unamortized debt issuance cost | 9,500,000 |  |  |  |  |  |  |
Legal expenses | 35,000 |  |  |  |  |  |  |
Credit Agreement | Line of Credit | DDTL Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 50,000,000 |  |  |  |  |  |
Commitment fee percentage |  | 1.00% |  |  |  |  |  |
2021 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 26,737,000 |  | $ 26,737,000 |  | $ 26,737,000 | $ 125,000,000
Interest rate |  | 2.00% |  |  |  |  |  | 2.00%
Debt issuance costs |  |  |  |  |  |  |  | $ 4,600,000
Senior Credit Facilities | Secured Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 4,700,000 |  |  |  |  |  |
Non-cash amortization of debt discount and debt issuance costs |  |  |  | $ 600,000 |  | $ 1,700,000 |  |
Repayments of long-term lines of credit | 98,600,000 |  |  |  |  |  |  |
Payments of make-whole premium | 9,700,000 |  |  |  |  |  |  |
Accrued interest | $ 200,000 |  |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | After the Second Anniversary of the Closing of the Senior Credit Facilities but Prior to the Third Anniversary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption, call protection premium, percentage |  | 4.00% |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | After the Third Anniversary of the Closing of the Senior Credit Facilities but Prior to the Fourth Anniversary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption, call protection premium, percentage |  | 3.00% |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | After the Fourth Anniversary of the Closing of the Senior Credit Facilities but Prior to the Fifth Anniversary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption, call protection premium, percentage |  | 2.00% |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term |  | 91 days |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | Eurodollar |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 8.00% |  |  |  |  |  |
Senior Credit Facilities | Secured Debt | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 7.00% |  |  |  |  |  |

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