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Lease Commitments - Lease cost and other information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Lease Cost Components: |  |  |
Amortization of ROU assets - finance leases | $ 466 | $ 289 |
Interest on lease liabilities - finance leases | 56 | 44 |
Operating lease cost (cost resulting from lease payments) | 17,236 | 14,266 | $ 8,804
Short-term lease expense | 446 | 404 | 494
Variable lease cost (cost excluded from lease payments) | 2,768 | 1,081 | 430
Total lease cost | 20,972 | 16,084 | 9,728
Supplemental Cash Flow and Other Information Related to Leases: |  |  |
Finance lease - operating cash flows | 56 | 42 |
Finance lease - financing cash flows | 427 | 255 |
Operating lease - operating cash flows (fixed payments) | 16,435 | 12,876 | 7,725
Operating lease - operating cash flows (net change asset/liability) | (12,790) | (9,123) | 1,457
New ROU assets - operating leases | $ 9,623 | 43,583 | $ 10,239
New ROU assets - finance leases |  | $ 5,374 |
Weighted - average remaining lease term (years) - finance leases | 6 years 4 months 28 days | 7 years 4 months 24 days |
Weighted - average remaining lease term (years) - Operating leases | 10 years 11 months 12 days | 11 years 6 months 3 days | 14 years 1 month 20 days
Weighted - average discount rate - finance leases | 1.70% | 1.70% |
Weighted - average discount rate - Operating leases | 3.20% | 3.30% | 3.90%
Maturity Analysis of Lease Liabilities: |  |  |
2022 | $ 15,215 |  |
2023 | 14,510 |  |
2024 | 13,340 |  |
2025 | 11,932 |  |
2025 | 11,468 |  |
Thereafter | 73,647 |  |
Total undiscounted cash flows | 140,112 |  |
Discount on cash flows | (24,198) |  |
Total operating lease liabilities | $ 115,914 | $ 118,300 |

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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=123408670&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=123391704&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=123414884&loc=SL77918982-209971 + Details
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