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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  | December 31, 2019
ROU assets (Property, plant and equipment, net) | $ | 60,271 |  |  | $ | 32,307 |
Current portion of lease liabilities (Accrued expenses) | 5,840 |  |  | 801 |
Long-term portion of lease liabilities (Other long-term liabilities) | 55,038 |  |  | 34,517 |
Schedule of Lease Expense and Other Information | The Company’s lease expense was as follows (in thousands):
|  |  | For the year ended December 31, 2020 |  | For the year ended December 31, 2019
Operating lease cost |  |  | $ | 53,194 |  |  | $ | 55,402 |
Finance lease cost: |  |  |  |  |
Amortization of ROU assets |  |  | 4,966 |  |  | 1,142 |
Interest on lease liabilities |  |  | 1,523 |  |  | 1,415 |
Total finance lease cost |  |  | 6,489 |  |  | 2,557 |
Short-term lease cost |  |  | 70,692 |  |  | 84,749 |
Variable lease cost |  |  | 3,691 |  |  | 6,702 |
Total lease cost |  |  | $ | 134,066 |  |  | $ | 149,410 |
Rent expense, including short-term rentals for the year ended December 31, 2018, prior to the Company's adoption of ASC 842, was $141.1 million. Other information related to leases was as follows:
Weighted Average Remaining Lease Term (years) | December 31, 2020 |  | December 31, 2019
Operating leases | 5.1 |  | 5.1
Finance leases | 9.3 |  | 21.3
Weighted Average Discount Rate |  |  |
Operating leases | 4.89 | % |  | 5.29 | %
Finance leases | 3.57 | % |  | 4.97 | %
The weighted average remaining lease term of the finance leases decreased significantly due to the 2020 acquisition of the Company's corporate headquarters which had previously been recognized as a finance lease.
Supplemental Cash Flow Related Disclosures (in thousands) | For the year ended December 31, 2020 |  | For the year ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities |  |  |
Operating cash flows from operating leases | $ | 53,498 |  |  | $ | 56,240 |
Operating cash flows from finance leases | 1,523 |  |  | 1,415 |
Financing cash flows from finance leases | 4,469 |  |  | 586 |
ROU assets obtained in exchange for operating lease liabilities | 34,358 |  |  | 17,699 |
ROU assets obtained in exchange for finance lease liabilities | 32,526 |  |  | 33,449 |
Schedule of Operating Lease Maturity | At December 31, 2020, 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, 2020
Operating Leases |  | Finance Leases
2021 | $ | 45,341 |  |  | $ | 8,407 |
2022 | 37,629 |  |  | 8,972 |
2023 | 29,014 |  |  | 8,281 |
2024 | 21,048 |  |  | 8,248 |
2025 | 14,672 |  |  | 7,573 |
Thereafter | 25,064 |  |  | 31,632 |
Total future lease payments | 172,768 |  |  | 73,113 |
Amount representing interest | (21,760) |  |  | (12,235) |
Total lease liabilities | $ | 151,008 |  |  | $ | 60,878 |
Schedule of Finance Lease Maturity | At December 31, 2020, 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, 2020
Operating Leases |  | Finance Leases
2021 | $ | 45,341 |  |  | $ | 8,407 |
2022 | 37,629 |  |  | 8,972 |
2023 | 29,014 |  |  | 8,281 |
2024 | 21,048 |  |  | 8,248 |
2025 | 14,672 |  |  | 7,573 |
Thereafter | 25,064 |  |  | 31,632 |
Total future lease payments | 172,768 |  |  | 73,113 |
Amount representing interest | (21,760) |  |  | (12,235) |
Total lease liabilities | $ | 151,008 |  |  | $ | 60,878 |

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