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Leases - Components of lease expense, and lease assets and liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Lease Cost |  |  |  |  |
Amortization of right-to-use assets (included in depreciation expense) | $ 177 | $ 178 | $ 532 | $ 534 |
Interest on lease liabilities | 102 | 135 | 329 | 422 |
Operating lease cost | 3,936 | 4,181 | 12,074 | 12,861 |
Short-term lease cost | 105 | 131 | 483 | 452 |
Variable lease cost | 406 | 595 | 1,322 | 1,391 |
Total lease cost | 4,726 | $ 5,220 | 14,740 | 15,660 |
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows from finance lease |  |  | 354 | 444 |
Operating cash flows from operating leases |  |  | 11,798 | 11,142 |
Financing cash flows from finance lease |  |  | 980 | 864 |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  | 16,470 | $ 15,282 |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |
Finance lease right-of-assets (included in other assets) | $ 1,778 |  | $ 1,778 |  | $ 2,311
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets, net |  | Other assets, net |  |
Operating lease right-of-use assets | $ 82,849 |  | $ 82,849 |  | 76,859
Finance lease liability, current (included in current installments of long-term debt) | $ 1,457 |  | $ 1,457 |  | 1,325
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Long Term Debt And Capital Lease Obligations Current |  | Long Term Debt And Capital Lease Obligations Current |  |
Finance lease liability, noncurrent (included in long-term debt) | $ 2,543 |  | $ 2,543 |  | 3,654
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Long Term Debt And Capital Lease Obligations |  | Long Term Debt And Capital Lease Obligations |  |
Operating lease liability, current (included in other accrued liabilities) | $ 11,466 |  | $ 11,466 |  | 11,043
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |  | Other Liabilities, Current |  |
Operating lease liability, noncurrent | $ 74,407 |  | $ 74,407 |  | $ 67,898
Weighted average remaining lease term finance leases | 2 years 9 months 18 days |  | 2 years 9 months 18 days |  | 3 years 6 months
Weighted average remaining lease term operating leases | 10 years 1 month 6 days |  | 10 years 1 month 6 days |  | 10 years 2 months 12 days
Weighted average discount rate finance leases | 10.10% |  | 10.10% |  | 10.10%
Weighted average discount rate operating leases | 4.40% |  | 4.40% |  | 4.70%

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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