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LEASES (Tables) | 9 Months Ended
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Sep. 30, 2021
LEASES |
Schedule of components of lease expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30 | ​ | September 30 | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | (in thousands) | ​
Operating lease expense | ​ | $ | 6,575 | ​ | $ | 6,351 | ​ | $ | 19,801 | ​ | $ | 17,950 | ​
Variable lease expense | ​ | ​ | 957 | ​ | ​ | 665 | ​ | ​ | 3,252 | ​ | ​ | 2,248 | ​
Sublease income | ​ | ​ | (157) | ​ | ​ | (120) | ​ | ​ | (468) | ​ | ​ | (254) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total operating lease expense(1) | ​ | $ | 7,375 | ​ | $ | 6,896 | ​ | $ | 22,585 | ​ | $ | 19,944 | ​
(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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30 | ​
​ | ​ | 2021 | ​ | 2020 |
​ | ​ | (in thousands) | ​
Noncash change in operating right-of-use assets | ​ | $ | 17,256 | ​ | $ | 15,718 | ​
Change in operating lease liabilities | ​ | ​ | (16,606) | ​ | ​ | (15,484) | ​
Operating right-of-use-assets and lease liabilities, net | ​ | $ | 650 | ​ | $ | 234 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | (19,128) | ​ | $ | (17,715) | ​
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Equipment | ​
​ | ​ | ​ | ​ | ​ | Land and | ​ | and | ​
​ |  | Total |  | Structures(1) |  | Other |
​ |  | (in thousands) | ​
Remainder of 2021 | ​ | $ | 6,616 | ​ | $ | 6,529 | ​ | $ | 87 | ​
2022 | ​ |  | 23,448 | ​ |  | 23,180 | ​ |  | 268 | ​
2023 | ​ |  | 18,392 | ​ |  | 18,367 | ​ |  | 25 | ​
2024 | ​ |  | 16,098 | ​ |  | 16,098 | ​ |  | — | ​
2025 | ​ |  | 13,397 | ​ |  | 13,397 | ​ |  | — | ​
Thereafter | ​ |  | 44,108 | ​ |  | 44,108 | ​ |  | — | ​
Total lease payments | ​ | ​ | 122,059 | ​ | ​ | 121,679 | ​ | ​ | 380 | ​
Less imputed interest | ​ | ​ | (12,062) | ​ | ​ | (12,060) | ​ | ​ | (2) | ​
Total | ​ | $ | 109,997 | ​ | $ | 109,619 | ​ | $ | 378 | ​
(1) | Excludes future minimum lease payments for a lease which was executed but had not yet commenced as of September 30, 2021 of $37.3 million which will be paid over approximately 10 years. The Company plans to take possession of the leased space in fourth quarter 2022.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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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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