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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2022
LEASES |
Schedule of components of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31
​ |  | 2022 |  | 2021 |  | 2020
​ | ​ | (in thousands)
Operating lease expense | ​ | $ | 31,790 | ​ | $ | 26,552 | ​ | $ | 24,559
Variable lease expense | ​ | ​ | 4,188 | ​ | ​ | 4,128 | ​ | ​ | 3,152
Sublease income | ​ | ​ | (391) | ​ | ​ | (626) | ​ | ​ | (398)
Total operating lease expense(1) | ​ | $ | 35,587 | ​ | $ | 30,054 | ​ | $ | 27,313
(1) | Operating lease expense excludes short-term leases with a term of 12 months or less.
​
Schedule of operating cash flows from operating lease activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31 | ​
​ |  | 2022 |  | 2021 |  | 2020 |
​ | ​ | (in thousands, except share and per share data) | ​
Noncash change in operating right-of-use assets | ​ | $ | 27,465 | ​ | $ | 24,023 | ​ | $ | 21,184 | ​
Change in operating lease liabilities | ​ | ​ | (24,513) | ​ | ​ | (23,400) | ​ | ​ | (20,428) | ​
Operating right-of-use-assets and lease liabilities, net | ​ | $ | 2,952 | ​ | $ | 623 | ​ | $ | 756 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | (28,830) | ​ | $ | (25,909) | ​ | $ | (23,810) | ​
​
Schedule of supplemental balance sheet information related to lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022
​ | ​ | (in thousands, except lease term and discount rate)
​ | ​ | ​ | ​ | ​ | Land and | ​ | Equipment
​ | ​ | ​ | Total | ​ | Structures | ​ | and Others
Operating right-of-use assets (long-term) | ​ | $ | 166,515 | ​ | $ | 165,822 | ​ | $ | 693
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities (current) | ​ | $ | 26,225 | ​ | $ | 25,824 | ​ | $ | 401
Operating lease liabilities (long-term) | ​ |  | 147,828 | ​ | ​ | 147,534 | ​ | ​ | 294
Total operating lease liabilities | ​ | $ | 174,053 | ​ | $ | 173,358 | ​ | $ | 695
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (in years) | ​ | ​ | 7.6 | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average discount rate | ​ | ​ | 3.58% | ​ | ​ | ​ | ​ | ​ | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2021 |
​ | ​ | (in thousands, except lease term and discount rate) | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | Equipment | ​
​ | ​ | ​ | Total | ​ | Structures | ​ | and Others | ​
Operating right-of-use assets (long-term) | ​ | $ | 106,686 | ​ | $ | 106,394 | ​ | $ | 292 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities (current) | ​ | $ | 22,740 | ​ | $ | 22,477 | ​ | $ | 263 | ​
Operating lease liabilities (long-term) | ​ |  | 88,835 | ​ | ​ | 88,810 | ​ | ​ | 25 | ​
Total operating lease liabilities | ​ | $ | 111,575 | ​ | $ | 111,287 | ​ | $ | 288 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (in years) | ​ | ​ | 6.9 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average discount rate | ​ | ​ | 2.88% | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of maturities of operating lease liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | (in thousands) | ​
2023 | ​ | $ | 31,868 | ​ | $ | 31,446 | ​ | $ | 422 | ​
2024 | ​ |  | 30,762 | ​ |  | 30,464 | ​ |  | 298 | ​
2025 | ​ |  | 26,889 | ​ |  | 26,889 | ​ |  | — | ​
2026 | ​ |  | 24,442 | ​ |  | 24,442 | ​ |  | — | ​
2027 | ​ |  | 19,349 | ​ |  | 19,349 | ​ |  | — | ​
Thereafter | ​ |  | 67,474 | ​ |  | 67,474 | ​ |  | — | ​
Total lease payments | ​ | ​ | 200,784 | ​ | ​ | 200,064 | ​ | ​ | 720 | ​
Less imputed interest | ​ | ​ | (26,731) | ​ | ​ | (26,706) | ​ | ​ | (25) | ​
Total | ​ | $ | 174,053 | ​ | $ | 173,358 | ​ | $ | 695 | ​
​
(1) | Excludes future minimum lease payments for leases which were executed but had not yet commenced as of December 31, 2022, of $32.0 million which will be paid over approximately 10 years.

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918701-209980 + Details
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