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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Supplemental Lease Balance Sheet Information | The following table presents our finance lease balances and their classification on the consolidated balance sheets (in thousands):
Finance Lease Balances (Classification) | December 31, 2021 |  | December 31, 2020
ROU assets (Property, plant and equipment, net) | $ | 81,267 |  |  | $ | 60,271 |
Current portion of lease liabilities (Accrued expenses) | 10,893 |  |  | 5,840 |
Long-term portion of lease liabilities (Other long-term liabilities) | 72,051 |  |  | 55,038 |
Schedule of Lease Expense and Other Information | The Company’s lease expense was as follows (in thousands):
|  |  | For the years ended December 31,
|  |  | 2021 |  | 2020 |  | 2019
Operating lease cost |  |  | $ | 50,264 |  |  | $ | 53,194 |  |  | $ | 55,402 |
Finance lease cost: |  |  |  |  |  |  |
Amortization of ROU assets |  |  | 9,504 |  |  | 4,966 |  |  | 1,142 |
Interest on lease liabilities |  |  | 2,544 |  |  | 1,523 |  |  | 1,415 |
Total finance lease cost |  |  | 12,048 |  |  | 6,489 |  |  | 2,557 |
Short-term lease cost |  |  | 102,913 |  |  | 70,692 |  |  | 84,749 |
Variable lease cost |  |  | 3,546 |  |  | 3,691 |  |  | 6,702 |
Total lease cost |  |  | $ | 168,771 |  |  | $ | 134,066 |  |  | $ | 149,410 |
Other information related to leases was as follows:
Weighted Average Remaining Lease Term (years) | December 31, 2021 |  | December 31, 2020
Operating leases | 4.4 |  | 5.1
Finance leases | 8.1 |  | 9.3
Weighted Average Discount Rate | December 31, 2021 |  | December 31, 2020
Operating leases | 4.35 | % |  | 4.89 | %
Finance leases | 3.65 | % |  | 3.57 | %
| For the years ended December 31,
Supplemental Cash Flow Related Disclosures (in thousands) | 2021 |  | 2020 |  | 2019
Cash paid for amounts related to lease liabilities: |  |  |  |  |
Operating cash flows from operating leases | $ | 50,963 |  |  | $ | 53,498 |  |  | $ | 56,240 |
Operating cash flows from finance leases | 2,544 |  |  | 1,523 |  |  | 1,415 |
Financing cash flows from finance leases | 8,458 |  |  | 4,469 |  |  | 586 |
ROU assets obtained in exchange for operating lease liabilities (1) | 55,556 |  |  | 34,358 |  |  | 17,699 |
ROU assets obtained in exchange for finance lease liabilities | 30,476 |  |  | 32,526 |  |  | 33,449 |
_____________ (1) Includes $34.3 million of operating leases acquired with the HydroChemPSC business
Schedule of Operating Lease Maturity | At December 31, 2021, the Company's future lease payments under non-cancelable leases that have lease terms in excess of one year were as follows (in thousands):
Years ending December 31, | December 31, 2021
Operating Leases |  | Finance Leases
2022 | $ | 56,124 |  |  | $ | 14,442 |
2023 | 44,515 |  |  | 12,915 |
2024 | 32,302 |  |  | 12,253 |
2025 | 20,599 |  |  | 11,578 |
2026 | 13,735 |  |  | 11,591 |
Thereafter | 17,233 |  |  | 34,077 |
Total future lease payments | 184,508 |  |  | 96,856 |
Amount representing interest | (18,903) |  |  | (13,912) |
Total lease liabilities | $ | 165,605 |  |  | $ | 82,944 |
Schedule of Finance Lease Maturity | At December 31, 2021, the Company's future lease payments under non-cancelable leases that have lease terms in excess of one year were as follows (in thousands):
Years ending December 31, | December 31, 2021
Operating Leases |  | Finance Leases
2022 | $ | 56,124 |  |  | $ | 14,442 |
2023 | 44,515 |  |  | 12,915 |
2024 | 32,302 |  |  | 12,253 |
2025 | 20,599 |  |  | 11,578 |
2026 | 13,735 |  |  | 11,591 |
Thereafter | 17,233 |  |  | 34,077 |
Total future lease payments | 184,508 |  |  | 96,856 |
Amount representing interest | (18,903) |  |  | (13,912) |
Total lease liabilities | $ | 165,605 |  |  | $ | 82,944 |

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