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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