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LEASE COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Operating Leases |  |
Operating lease right-of-use assets | $ 72,377 | $ 83,222
Operating lease liability, current | $ 16,578 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Accounts Payable, Accrued Liabilities, and Derivative Liabilities, Current |
Operating lease liabilities | $ 55,276 | $ 61,331
Total operating lease liabilities | 71,854 |
Finance Leases |  |
Finance leases included in property, plant and equipment, gross | 47,020 |
Accumulated depreciation of finance leases included in property, plant and equipment, net | (4,271) |
Total finance leases | $ 42,749 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Property, Plant and Equipment, Net |
Current portion of finance lease liabilities | $ 4,318 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Long-term Debt and Capital Lease Obligations, Current |
Noncurrent portion of finance lease liabilities | $ 25,634 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Long-term Debt and Capital Lease Obligations |
Total finance lease liabilities | $ 29,952 |
Weighted Average Remaining Lease Term (in years) |  |
Operating leases | 6 years 1 month 6 days |
Finance leases | 7 years |
Weighted Average Discount Rate |  |
Operating leases | 5.05% |
Finance leases | 5.13% |

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