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Leases - Lease cost and other information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lease Cost Components:          
Amortization of ROU assets - finance leases $ 117 $ 47 $ 233 $ 47  
Interest on lease liabilities - finance leases 14 5 29 5  
Operating lease cost (cost resulting from lease payments) 4,342 3,058 8,685 5,316  
Short-term lease expense 75 99 211 197  
Variable lease cost (cost excluded from lease payments) 643 203 1,291 369  
Total lease cost 5,191 3,412 10,449 5,934  
Supplemental Cash Flow and Other Information Related to Leases:          
Finance lease - operating cash flows 14 8 29 8  
Finance lease - financing cash flows 106 40 213 40  
Operating lease - operating cash flows (fixed payments) 4,173 2,784 8,313 4,456  
Operating lease - operating cash flows (net change asset/liability) $ (3,255) (2,409) (6,475) (2,678)  
New ROU assets - operating leases   39,278 $ 1,298 39,736  
New ROU assets - finance leases   $ 5,374   $ 5,374  
Weighted - average remaining lease term (years) - finance leases 6 years 10 months 28 days 10 years 7 months 17 days 6 years 10 months 28 days 10 years 7 months 17 days  
Weighted - average remaining lease term (years) - Operating leases 11 years 1 month 20 days 11 years 9 months 21 days 11 years 1 month 20 days 11 years 9 months 21 days  
Weighted - average discount rate - finance leases 1.70% 1.90% 1.70% 1.90%  
Weighted - average discount rate - Operating leases 3.30% 3.30% 3.30% 3.30%  
Maturity Analysis of Lease Liabilities:          
2021 (excluding the six months ended June 30, 2021) $ 8,045   $ 8,045    
2022 14,992   14,992    
2023 14,290   14,290    
2024 12,552   12,552    
2025 11,016   11,016    
Thereafter 79,220   79,220    
Total undiscounted cash flows 140,115   140,115    
Discount on cash flows (25,366)   (25,366)    
Total operating lease liabilities $ 114,749   $ 114,749   $ 118,300