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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