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Leases | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
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 10 years and most include options to extend the lease term, at our discretion, for an additional one to five years. We are not, however, reasonably certain that we will exercise any of the options to extend and as such, they have not been included in the remaining lease terms. Balance sheet information related to our operating leases follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | December 31,
​ |  | Classification |  | 2020 |  | 2019
ROU assets |  | Operating lease ROU assets | ​ | $ | 19,236 | ​ | $ | 17,901
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease liabilities |  |  | ​ |  |  | ​ |  |
Current |  | Accrued liabilities | ​ | $ | 3,564 | ​ | $ | 3,037
Noncurrent |  | Operating lease liabilities | ​ |  | 16,925 | ​ |  | 16,094
Total lease liabilities |  |  | ​ | $ | 20,489 | ​ | $ | 19,131
​ The components of lease cost follow (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2020 | ​ | 2019
Operating lease cost | ​ | $ | 4,508 | ​ | $ | 3,966
Short-term lease cost | ​ |  | 52 | ​ |  | 348
Variable lease cost | ​ |  | 1,652 | ​ |  | 1,607
Total lease cost | ​ | $ | 6,212 | ​ | $ | 5,921
​ Cash flow and noncash information related to our operating leases follow (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ | ​ | 2020 | ​ | 2019
Operating cash flows - cash paid for amounts included in the measurement of operating lease liabilities | ​ | $ | 5,885 | ​ | $ | 5,420
Operating lease ROU assets obtained in exchange for new lease liabilities | ​ |  | 4,812 | ​ |  | 2,247
​ Other supplemental information related to our operating leases follows:
​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |
​ | ​ | 2020 | ​ | 2019 | ​
Weighted average remaining lease term (in years) | ​ | 7.9 | ​ | 8.2 | ​
Weighted average discount rate | ​ | 4.8 | % | 5.3 | %
​ Remaining maturities of lease liabilities as of December 31, 2020 were as follows (in thousands):
​ | ​ | ​ | ​
2021 |  | $ | 4,126
2022 | ​ | ​ | 3,288
2023 | ​ |  | 2,933
2024 | ​ |  | 2,513
2025 | ​ |  | 2,213
Thereafter | ​ |  | 9,766
Total lease payments | ​ |  | 24,839
Less: Interest | ​ |  | (4,350)
Total lease liabilities | ​ | $ | 20,489
​

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 + Details
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