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Leases | 12 Months Ended
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Dec. 31, 2023
Leases |
Leases | 8. Leases We have operating leases and subleases for office space, temporary housing, storage and shops. Our leases have remaining lease terms of less than one year to approximately nine years and most include options to extend the lease term, at our discretion, for an additional one to ten years. We are not, however, reasonably certain that we will exercise any of the options to extend them and as such, they have not been included in the remaining lease terms. Financial and other supplemental information related to our operating leases is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | December 31,
(in thousands) |  | Classification |  | 2023 |  | 2022
ROU assets |  | Operating lease ROU assets | ​ | $ | 14,097 | ​ | $ | 16,706
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease liabilities |  |  | ​ |  |  | ​ |  |
Current |  | Accrued liabilities | ​ | $ | 3,160 | ​ | $ | 3,244
Noncurrent |  | Operating lease liabilities | ​ |  | 12,271 | ​ |  | 14,861
Total lease liabilities |  |  | ​ | $ | 15,431 | ​ | $ | 18,105
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021
Operating lease cost | ​ | $ | 4,131 | ​ | $ | 4,041 | ​ | $ | 4,836
Short-term lease cost | ​ |  | 412 | ​ |  | 447 | ​ |  | 169
Variable lease cost | ​ |  | 1,881 | ​ |  | 1,802 | ​ |  | 2,123
Total lease cost | ​ | $ | 6,424 | ​ | $ | 6,290 | ​ | $ | 7,128
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) | ​ | 2023 | ​ | 2022 | ​ | 2021
Operating cash flows - cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | 6,157 | ​ | $ | 5,951 | ​ | $ | 6,568
Operating lease ROU assets obtained in exchange for lease liabilities, net (1) | ​ |  | 710 | ​ |  | 2,421 | ​ |  | 2,135
(1) Includes decreases to our ROU assets of $0.04 million, $0.2 million, and $0.3 million related to lease amendments and terminations during 2023, 2022 and 2021 respectively. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021 | ​
Weighted average remaining lease term (in years) | ​ | 6.0 | ​ | 6.7 | ​ | 7.2 | ​
Weighted average discount rate | ​ | 4.9 | % | 4.7 | % | 4.6 | %
​ Remaining maturities of our lease liabilities as of December 31, 2023 are as follows: ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
2024 | ​ | $ | 3,577
2025 | ​ | ​ | 2,979
2026 | ​ |  | 2,556
2027 | ​ |  | 2,374
2028 | ​ | ​ | 2,193
Thereafter | ​ |  | 4,295
Total lease payments | ​ |  | 17,974
Less: Interest | ​ |  | (2,543)
Total lease liabilities | ​ | $ | 15,431
​

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- Definition The entire disclosure for operating leases of lessee. Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//842-20/tableOfContent + Details
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