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DEBT - Long-Term Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total finance lease liabilities | $ 30,025 | $ 29,952 |  |
Unamortized debt issuance costs | (1,663) | (2,241) |  |
Long-term debt and lease obligation, including current maturities | 1,120,664 | 1,151,441 |  |
Current maturities of long-term obligations | (65,666) | (65,988) | $ (65,309) | $ (62,678)
Long-Term Obligations, net of unamortized debt issuance costs | $ 1,054,998 | 1,085,453 | $ 1,129,238 | $ 1,125,993
Consolidated leverage ratio | 1.63 |  |  |
Consolidated interest coverage ratio | 16.86 |  |  |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated interest coverage ratio | 3.00 |  |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Consolidated leverage ratio | 3.50 |  |  |
Notes payable 0.00% – 10.90%, due in monthly and annual installments through 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 14,002 | 19,220 |  |
Notes payable 0.00% – 10.90%, due in monthly and annual installments through 2028 | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 0.00% |  |  |
Notes payable 0.00% – 10.90%, due in monthly and annual installments through 2028 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on notes | 10.90% |  |  |
Senior unsecured notes 3.2%, due in 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 75,000 | 75,000 |  |
Interest rate on notes | 3.20% |  |  |
Senior unsecured debts 1.7% USD floating swapped to 1.36% EUR fixed, equal annual installments through 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 112,000 | 168,000 |  |
Interest rate on notes | 1.36% |  |  |
Floating interest rate prior to conversion to fixed interest rate | 1.70% |  |  |
Senior unsecured notes 3.5%, due in 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 125,000 | 125,000 |  |
Interest rate on notes | 3.50% |  |  |
Senior unsecured notes 1.0%, due in 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 122,100 | 112,170 |  |
Interest rate on notes | 1.00% |  |  |
Senior unsecured notes 3.4%, due in 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 50,000 | 50,000 |  |
Interest rate on notes | 3.40% |  |  |
Senior unsecured notes 3.5%, due in 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 100,000 | 100,000 |  |
Interest rate on notes | 3.50% |  |  |
Senior unsecured notes 1.2%, due in 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 244,200 | 224,340 |  |
Interest rate on notes | 1.20% |  |  |
Senior unsecured notes 3.6%, due in 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 125,000 | 125,000 |  |
Interest rate on notes | 3.60% |  |  |
Senior unsecured notes 3.6%, due in 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | $ 125,000 | $ 125,000 |  |
Interest rate on notes | 3.60% |  |  |

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