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CORPORATE BORROWINGS - Narrative (Details) |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2021 USD ($) d | Apr. 01, 2021 USD ($) | Apr. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Jul. 29, 2021 USD ($) | Jul. 28, 2021 USD ($) | May 14, 2021 USD ($) | Feb. 14, 2020 USD ($) | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit agreement - revolver |  |  |  | $ 242,300,000 | $ 54,700,000 | $ 17,440,000 |  |  |  |  |  |
Unamortized loan fees |  |  |  | 6,454,000 | 129,000 |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | 239,853,000 | 40,000,000 |  |  |  |  |  |  |
Credit Agreement Due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement - revolver |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 300,000,000 |
Credit Agreement Due 2025 | Luxco |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit agreement - revolver |  | $ 242,300,000 |  |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New loan fees |  |  |  | 666,000 |  |  |  |  |  |  |  |
Unamortized loan fees |  |  |  | 1,529,000 |  |  |  |  |  |  |  |
Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized loan fees |  |  |  | 110,000 |  |  |  |  |  |  |  |
Secured Debt | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New loan fees |  |  |  | 0 |  |  |  |  |  |  |  |
Term loan face amount |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Secured Debt | Note Purchase Agreement Due 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 18,400,000 | 20,000,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |
Senior secured notes, stated interest rate |  |  |  | 3.53% |  |  |  |  |  |  |  | 3.50%
Secured Debt | Note Purchase Agreement Due 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 20,000,000 | 20,000,000 |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Senior secured notes, stated interest rate |  |  |  | 3.80% |  |  |  |  |  |  |  |
Convertible Debt | Convertible Note 1.88% Due 2041 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
New loan fees |  |  |  | $ 6,384,000 |  |  |  |  |  |  |  |
Unamortized loan fees |  |  |  | 6,344,000 |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 201,250,000 | 0 |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 201,250,000 |  |  |  |  |  |  |  |  |  |  |
Senior secured notes, stated interest rate | 1.875% |  |  | 1.88% |  |  |  |  |  |  |  |
Conversion ratio | 10.3911 |  |  |  |  |  |  |  |  |  |  |
Threshold of trading days | d | 20 |  |  |  |  |  |  |  |  |  |  |
Threshold of consecutive trading days | d | 30 |  |  |  |  |  |  |  |  |  |  |
Threshold percentage | 130.00% |  |  |  |  |  |  |  |  |  |  |
Threshold of business day | d | 5 |  |  |  |  |  |  |  |  |  |  |
Threshold period | d | 10 |  |  |  |  |  |  |  |  |  |  |
Measurement percentage | 0.98 |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | Convertible Note 1.88% Due 2041 | Initial Purchasers |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 26,250,000 |  |  |  |  |  |  |  |  |  |  |
Revolver | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent increase in borrowing capacity |  |  |  |  |  |  |  |  |  | 100,000,000 |  |
Remaining borrowing capacity |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Credit Agreement, interest rate |  |  |  | 1.10% |  |  |  |  |  |  |  |
Revolver | Credit Agreement | Revolving Credit Agreement, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |
Credit Agreement, interest rate |  |  |  | 1.09% |  |  |  |  |  |  |  |
Revolver | Secured Debt | Note Purchase Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Term loan face amount |  |  |  |  |  |  |  | $ 140,000 | $ 105,000 | $ 105,000,000 |  |

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