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DEBT (Details) $ in Thousands, € in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 EUR (€) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 EUR (€)
Components of the company's debt obligations |  |  |  |  |  |  |
Consolidated Leverage Ratio |  | 1.71 |  |  | 1.71 |  |
Consolidated Interest Coverage Ratio |  | 16.21 |  |  | 16.21 |  |
Long-term obligations gross including current maturities |  | $ 1,153,682 | $ 1,191,489 |  |  |  |
Current maturities of long-term obligations |  | (65,988) | (62,678) |  |  |  |
Total long-term obligations |  | 1,087,694 | 1,128,811 |  |  |  |
Deferred Finance Costs, Net, Total |  | 2,241 | 2,818 |  |  |  |
Deferred debt issuance costs noncurrent |  | 2,241 | 2,818 |  |  |  |
Long-term obligations including current maturities |  | 1,151,441 | 1,188,671 |  |  |  |
Current maturities of long-term obligations |  | (65,988) | (62,678) |  |  | $ (65,309) |
Long-term obligations, net of unamortized debt issuance costs |  | 1,085,453 | 1,125,993 |  |  | $ 1,129,238 |
Aggregate long-term maturities, excluding finance lease obligations |  |  |  |  |  |  |
Year One |  | 61,670 |  |  |  |  |
Year Two |  | 61,337 |  |  |  |  |
Year Three |  | 135,324 |  |  |  |  |
Year Four |  | 239,826 |  |  |  |  |
Year Five |  | 375,169 |  |  |  |  |
After Year Five |  | $ 250,404 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Consolidated Interest Coverage Ratio |  | 3.00 |  |  | 3.00 |  |
Maximum |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Consolidated Leverage Ratio |  | 3.50 |  |  | 3.50 |  |
Unsecured lines of credit |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Average borrowings |  | $ 34,100 | $ 40,000 |  |  |  |
Average annual interest rate on short-term notes payable (as a percent) |  | 1.60% | 1.90% |  |  |  |
Compensating balance requirement |  | $ 0 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Credit facility interest and fees |  | 1,500 | $ 1,500 |  |  |  |
5-year revolving credit facility maturing in July 2022 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  | 300,000 |  |  | € 150.0 |  |
Amount outstanding under line of credit |  | 25,000 | 0 |  | € 0.0 |  | € 69.0
Notes payable |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Proceeds from debt | $ 280,000 |  |  | $ 280,000 |  |  |
Long-term obligations gross including current maturities |  | 168,000 | 224,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 390 | 541 |  |  |  |
Long-term obligations including current maturities |  | $ 167,610 | $ 223,459 |  |  |  |
Interest rate on notes (as a percent) |  | 1.36% | 1.36% |  | 1.36% |  | 1.36%
Floating interest rate prior to conversion to a fixed interest rate |  | 3.20% | 4.00% |  | 3.20% |  | 4.00%
Notes payable 0.00% - 10.90%, due in monthly and annual installments through 2028 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 19,220 | $ 15,531 |  |  |  |
Long-term obligations including current maturities |  | $ 19,220 | $ 15,531 |  |  |  |
Notes payable 0.00% - 10.90%, 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% | 0.00% |  | 0.00% |  | 0.00%
Notes payable 0.00% - 10.90%, due in monthly and annual installments through 2028 | Maximum |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Interest rate on notes (as a percent) |  | 10.90% | 16.00% |  | 10.90% |  | 16.00%
Senior unsecured notes 3.2%, due in 2022 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 75,000 | $ 75,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 64 | 88 |  |  |  |
Long-term obligations including current maturities |  | $ 74,936 | $ 74,912 |  |  |  |
Interest rate on notes (as a percent) |  | 3.20% | 3.20% |  | 3.20% |  | 3.20%
Senior unsecured notes 3.5%, due in 2023 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 125,000 | $ 125,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 144 | 181 |  |  |  |
Long-term obligations including current maturities |  | $ 124,856 | $ 124,819 |  |  |  |
Interest rate on notes (as a percent) |  | 3.50% | 3.50% |  | 3.50% |  | 3.50%
Senior unsecured notes 0.98%, due in 2023 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 112,170 | $ 114,535 |  |  |  |
Deferred Finance Costs, Net, Total |  | 356 | 432 |  |  |  |
Long-term obligations including current maturities |  | $ 111,814 | $ 114,103 |  |  |  |
Interest rate on notes (as a percent) |  | 1.00% | 1.00% |  | 1.00% |  | 1.00%
Senior unsecured notes 3.4%, due in 2024 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 50,000 | $ 50,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 63 | 76 |  |  |  |
Long-term obligations including current maturities |  | $ 49,937 | $ 49,924 |  |  |  |
Interest rate on notes (as a percent) |  | 3.40% | 3.40% |  | 3.40% |  | 3.40%
Senior unsecured notes 3.5%, due in 2024 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 100,000 | $ 100,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 144 | 181 |  |  |  |
Long-term obligations including current maturities |  | $ 99,856 | $ 99,819 |  |  |  |
Interest rate on notes (as a percent) |  | 3.50% | 3.50% |  | 3.50% |  | 3.50%
Senior unsecured notes 1.17%, due in 2024 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 224,340 | $ 229,070 |  |  |  |
Deferred Finance Costs, Net, Total |  | 742 | 904 |  |  |  |
Long-term obligations including current maturities |  | $ 223,598 | $ 228,166 |  |  |  |
Interest rate on notes (as a percent) |  | 1.20% | 1.20% |  | 1.20% |  | 1.20%
Senior unsecured notes 3.6%, due in 2025 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 125,000 | $ 125,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 169 | 207 |  |  |  |
Long-term obligations including current maturities |  | $ 124,831 | $ 124,793 |  |  |  |
Interest rate on notes (as a percent) |  | 3.60% | 3.60% |  | 3.60% |  | 3.60%
Senior unsecured notes 3.6%, due in 2026 |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 125,000 | $ 125,000 |  |  |  |
Deferred Finance Costs, Net, Total |  | 169 | 208 |  |  |  |
Long-term obligations including current maturities |  | $ 124,831 | $ 124,792 |  |  |  |
Interest rate on notes (as a percent) |  | 3.60% | 3.60% |  | 3.60% |  | 3.60%
Capital lease obligations |  |  |  |  |  |  |
Components of the company's debt obligations |  |  |  |  |  |  |
Long-term obligations gross including current maturities |  | $ 29,952 | $ 8,353 |  |  |  |
Long-term obligations including current maturities |  | $ 29,952 | $ 8,353 |  |  |  |

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