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v3.21.1

DEBT - Revolving Credit Facility (Details) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 21, 2020 USD ($) | Dec. 10, 2019 USD ($) | Oct. 26, 2018 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Potential additional borrowing capacity |  | $ 185,000,000.0 |  |  |  |
Letters of credit outstanding |  |  |  | $ 200,000 |  | $ 200,000
Ratio of Debt to EBITDA Step-Down |  | 4.0 |  |  |  |
Ratio of Debt to EBITDA Increase |  | 0.5 |  |  |  |
Unused commitment fees |  |  |  | 600,000 | $ 300,000 |
Amortization of debt issuance costs |  |  |  | 1,275,000 | 582,000 |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 500,000,000.0 | $ 350,000,000.0 |  |  |
Debt term |  | 5 years | 5 years |  |  |
Collateral, percent of domestic subsidiaries equity |  | 100.00% |  |  |  |
Collateral, percent of voting equity |  | 66.00% |  |  |  |
Collateral, percent of non-voting equity |  | 100.00% |  |  |  |
Collateral, percent of assets |  | 100.00% |  |  |  |
Collateral, percent of equity |  | 100.00% |  |  |  |
Letter of credit fronting fee percentage |  | 0.125% |  |  |  |
Fees and expense paid to lenders at closing | $ 1,100,000 |  | $ 2,800,000 |  |  |
Swingline Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Covenant amount |  | $ 10,000,000.0 |  |  |  |
Letters of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Covenant amount |  | $ 10,000,000.0 |  |  |  |
Fed Funds Effective Rate | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |
LIBOR | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |
Interest expense |  |  |  |  | 600,000 |
Minimum | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Unused capacity, commitment fee percentage |  | 0.25% |  |  |  |
Letter of credit participation fee percentage |  | 1.25% |  |  |  |
Minimum | LIBOR | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |  |
Minimum | Base Rate | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 0.25% |  |  |  |
Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Ratio of Debt to EBITDA to Increase Revolving Commitment |  | 2.50 |  |  |  |
Ratio of Debt to EBITDA |  | 4.5 |  |  |  |
Maximum | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Unused capacity, commitment fee percentage |  | 0.45% |  |  |  |
Letter of credit participation fee percentage |  | 2.00% |  |  |  |
Maximum | LIBOR | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |
Maximum | Base Rate | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Interest expense |  |  |  | 1,100,000 | 1,100,000 |
Amortization of debt issuance costs |  |  |  | $ 500,000 | $ 200,000 |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Covenant amount | $ 200,000,000.0 |  |  |  |  |
Floor interest rate | 0.75% |  |  |  |  |
Unused capacity, commitment fee percentage | 0.50% |  |  |  |  |
Line of Credit | LIBOR | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |
Line of Credit | Base Rate | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |

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