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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2021
LEASES |
Schedule of components of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31
​ |  | 2021 |  | 2020 |  | 2019
​ | ​ | (in thousands)
Operating lease expense | ​ | $ | 26,552 | ​ | $ | 24,559 | ​ | $ | 22,291
Variable lease expense | ​ | ​ | 4,128 | ​ | ​ | 3,152 | ​ | ​ | 3,366
Sublease income | ​ | ​ | (626) | ​ | ​ | (398) | ​ | ​ | (324)
Total operating lease expense(1) | ​ | $ | 30,054 | ​ | $ | 27,313 | ​ | $ | 25,333
(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 | ​
​ | ​ | 2021 | ​ | 2020 |  | 2019 | ​
​ | ​ | (in thousands) | ​
Noncash change in operating right-of-use assets | ​ | $ | 24,023 | ​ | $ | 21,184 | ​ | $ | 20,439 | ​
Change in operating lease liabilities | ​ | ​ | (23,400) | ​ | ​ | (20,428) | ​ | ​ | (19,711) | ​
Operating right-of-use-assets and lease liabilities, net | ​ | $ | 623 | ​ | $ | 756 | ​ | $ | 728 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | (25,909) | ​ | $ | (23,810) | ​ | $ | (21,714) | ​
Schedule of supplemental balance sheet information related to lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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% | ​ | ​ | ​ | ​ | ​ | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020 |
​ | ​ | (in thousands, except lease term and discount rate) | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | Equipment | ​
​ | ​ | ​ | Total | ​ | Structures | ​ | and Others | ​
Operating right-of-use assets (long-term) | ​ | $ | 115,195 | ​ | $ | 114,908 | ​ | $ | 287 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities (current) | ​ | $ | 21,482 | ​ | $ | 21,207 | ​ | $ | 275 | ​
Operating lease liabilities (long-term) | ​ |  | 97,839 | ​ | ​ | 97,828 | ​ | ​ | 11 | ​
Total operating lease liabilities | ​ | $ | 119,321 | ​ | $ | 119,035 | ​ | $ | 286 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term (in years) | ​ | ​ | 6.7 | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average discount rate | ​ | ​ | 3.18% | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of maturities of operating lease liabilities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | (in thousands) | ​
2022 | ​ | $ | 25,567 | ​ | $ | 25,302 | ​ | $ | 265 | ​
2023 | ​ |  | 19,800 | ​ |  | 19,775 | ​ |  | 25 | ​
2024 | ​ |  | 17,414 | ​ |  | 17,414 | ​ |  | — | ​
2025 | ​ |  | 14,839 | ​ |  | 14,839 | ​ |  | — | ​
2026 | ​ |  | 11,404 | ​ |  | 11,404 | ​ |  | — | ​
Thereafter | ​ |  | 33,750 | ​ |  | 33,750 | ​ |  | — | ​
Total lease payments | ​ | ​ | 122,774 | ​ | ​ | 122,484 | ​ | ​ | 290 | ​
Less imputed interest | ​ | ​ | (11,199) | ​ | ​ | (11,197) | ​ | ​ | (2) | ​
Total | ​ | $ | 111,575 | ​ | $ | 111,287 | ​ | $ | 288 | ​
​
(1) | Excludes future minimum lease payments for leases which were executed but had not yet commenced as of December 31, 2021 of $85.3 million which will be paid over 10-12 years. The Company plans to take possession of the leased spaces during 2022.

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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 http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 + Details
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