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Leases - Lease cost and other information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lease Cost Components:      
Amortization of ROU assets - finance leases $ 466 $ 466 $ 466
Interest on lease liabilities - finance leases 41 49 56
Operating lease cost (cost resulting from lease payments) 17,123 17,782 17,236
Short-term lease cost 429 820 446
Variable lease cost (cost excluded from lease payments) 3,196 2,399 2,768
Total lease cost 21,255 21,516 20,972
Supplemental Cash Flow and Other Information Related to Leases:      
Finance lease - operating cash flows 41 49 56
Finance lease - financing cash flows 449 434 427
Operating lease - operating cash flows (fixed payments) 16,710 17,253 16,435
Operating lease - operating cash flows (net change asset/liability) (13,414) (13,723) (12,790)
New ROU assets - operating leases $ 1,160 $ 12,635 $ 9,623
Weighted - average remaining lease term (years) - finance leases 4 years 5 months 4 days 5 years 5 months 1 day 6 years 4 months 28 days
Weighted - average remaining lease term (years) - operating leases 9 years 3 months 14 days 10 years 10 days 10 years 11 months 12 days
Weighted - average discount rate - finance leases 1.70% 1.70% 1.70%
Weighted - average discount rate - operating leases 3.10% 3.00% 3.20%
Maturity Analysis of Lease Liabilities:      
2024 $ 15,970    
2025 14,640    
2026 14,210    
2027 13,155    
2028 12,502    
Thereafter 56,090    
Total undiscounted cash flows 126,567    
Discount on cash flows (18,283)    
Total operating lease liabilities $ 108,284 $ 115,600  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities. Other Liabilities.