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DEBT - Long-Term Obligations (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2017
--- | --- | --- | ---
Components of the company's debt obligations |  |  |
Finance Lease Liabilities | $ 31,197 | $ 30,025 |
Unamortized debt issuance costs | (1,230) | (1,663) |
Long-term debt and lease obligation, including current maturities | 1,058,424 | 1,120,664 |
Current maturities of long-term obligations | (142,674) | (65,666) |
Total long-term obligations | $ 915,750 | 1,054,998 |
Consolidated Leverage Ratio | 1.76 |  |
Consolidated Interest Coverage Ratio | 19.39 |  |
Minimum |  |  |
Components of the company's debt obligations |  |  |
Consolidated Interest Coverage Ratio | 3.00 |  |
Maximum |  |  |
Components of the company's debt obligations |  |  |
Consolidated Leverage Ratio | 3.50 |  |
Notes payable 0.00% – 8.92%, due in monthly and annual installments through 2028 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 24,967 | 14,002 |
Notes payable 0.00% – 8.92%, due in monthly and annual installments through 2028 | Minimum |  |  |
Components of the company's debt obligations |  |  |
Interest rate on notes (as a percent) | 0.00% |  |
Notes payable 0.00% – 8.92%, due in monthly and annual installments through 2028 | Maximum |  |  |
Components of the company's debt obligations |  |  |
Interest rate on notes (as a percent) | 8.92% |  |
Senior unsecured notes 3.2%, due in 2022 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 75,000 | 75,000 |
Interest rate on notes (as a percent) | 3.20% |  |
Senior unsecured debts 1.26% USD floating swapped to 1.36% EUR fixed, due in 2022 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 56,000 | 112,000 |
Interest rate on notes (as a percent) | 1.36% |  | 1.36%
Floating interest rate prior to conversion to a fixed interest rate (as a percent) | 1.26% |  |
Senior unsecured notes 3.5%, due in 2023 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 125,000 | 125,000 |
Interest rate on notes (as a percent) | 3.50% |  |
Senior unsecured notes 1.0%, due in 2023 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 115,830 | 122,100 |
Interest rate on notes (as a percent) | 1.00% |  |
Senior unsecured notes 3.4%, due in 2024 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 50,000 | 50,000 |
Interest rate on notes (as a percent) | 3.40% |  |
Senior unsecured notes 3.5%, due in 2024 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 100,000 | 100,000 |
Interest rate on notes (as a percent) | 3.50% |  |
Senior unsecured notes 1.2%, due in 2024 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 231,660 | 244,200 |
Interest rate on notes (as a percent) | 1.20% |  |
Senior unsecured notes 3.6%, due in 2025 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 125,000 | 125,000 |
Interest rate on notes (as a percent) | 3.60% |  |
Senior unsecured notes 3.6%, due in 2026 |  |  |
Components of the company's debt obligations |  |  |
Long-term debt, gross | $ 125,000 | $ 125,000 |
Interest rate on notes (as a percent) | 3.60% |  |

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