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FINANCING ARRANGEMENTS - Summary of Financing Arrangements (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 7,535 | $ 7,535
Long-term debt, at par | 1,558,975 | 1,564,626
Unamortized debt issuance costs and premium, net | (12,691) | (14,985)
Long-term debt, at carrying value | 1,546,284 | 1,549,641
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 7,535 | 7,535
Long-term debt, at par | 713,975 | 719,626
Unsecured debt | Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes") |  |
Debt Instrument [Line Items] |  |
Long-term debt, at par | $ 545,000 | $ 545,000
Interest rate (as a percentage) | 4.875% | 4.875%
Unsecured debt | Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes") |  |
Debt Instrument [Line Items] |  |
Long-term debt, at par | $ 300,000 | $ 300,000
Interest rate (as a percentage) | 5.125% | 5.125%

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