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LEASE COMMITMENTS - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Operating Leases |  |  |  |
Operating lease right-of-use assets | $ 69,845 | $ 72,377 | $ 83,222 | $ 0
Accounts payable, accrued and other liabilities | 18,804 | 16,578 |  |
Operating lease liabilities | 52,212 | 55,276 | $ 61,331 | $ 0
Total operating lease liabilities | $ 71,016 | $ 71,854 |  |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent | us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent |  |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OperatingLeaseLiabilityNoncurrent | us-gaap:OperatingLeaseLiabilityNoncurrent |  |
Finance Leases |  |  |  |
Property, plant and equipment, gross | $ 49,760 | $ 47,020 |  |
Accumulated depreciation | (7,258) | (4,271) |  |
Property, plant and equipment, net | 42,502 | 42,749 |  |
Current maturities of long-term obligations, net of unamortized debt issuance cost | 4,258 | 4,318 |  |
Long-term obligations, net of unamortized debt issuance cost | 25,767 | 25,634 |  |
Total finance lease liabilities | $ 30,025 | $ 29,952 |  |
Weighted Average Remaining Lease Term (in years) |  |  |  |
Operating leases | 5 years | 6 years 1 month 6 days |  |
Finance leases | 7 years 2 months 12 days | 7 years |  |
Weighted Average Discount Rate |  |  |  |
Operating leases | 4.21% | 5.05% |  |
Finance leases | 4.85% | 5.13% |  |

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