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Leases - Lease cost and other information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Lease Cost Components: |  |
Amortization of ROU assets - finance leases | $ 117 |
Interest on lease liabilities - finance leases | 15 |
Operating lease cost (cost resulting from lease payments) | 4,343 | $ 2,258
Short-term lease expense | 135 | 98
Variable lease cost (cost excluded from lease payments) | 648 | 166
Total lease cost | 5,258 | 2,522
Supplemental Cash Flow and Other Information Related to Leases: |  |
Finance lease - operating cash flows | 15 |
Finance lease - financing cash flows | 106 |
Operating lease - operating cash flows (fixed payments) | 4,140 | 1,672
Operating lease - operating cash flows (net change asset/liability) | (3,220) | 268
New ROU assets - operating leases | $ 1,298 | $ 458
Weighted - average remaining lease term (years) - finance leases | 7 years 1 month 28 days |
Weighted - average remaining lease term (years) - Operating leases | 11 years 3 months 18 days | 13 years 11 months 1 day
Weighted - average discount rate - finance leases | 1.70% |
Weighted - average discount rate - Operating leases | 3.30% | 3.90%
Maturity Analysis of Lease Liabilities: |  |
2021 (excluding the three months ended March 31, 2021) | $ 15,931 |
2022 | 14,438 |
2023 | 13,705 |
2024 | 12,120 |
2025 | 10,703 |
Thereafter | 76,428 |
Total undiscounted cash flows | 143,325 |
Discount on cash flows | (26,258) |
Total operating lease liabilities | $ 117,067 |

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: 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 + Details
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