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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating lease cost (cost resulting from lease payments) $ 10,826 $ 10,149
Short-term lease cost 161 67
Variable lease cost (cost excluded from lease payments) 1,776 1,612
Sublease income (583) (560)
Net lease cost 12,180 11,268
Operating lease - operating cash flows (fixed payments) 9,811 9,678
Operating lease - operating cash flows (liability reduction) $ 7,187 $ 8,407
Weighted average lease term - operating leases (in years) (at period end) 15 years 11 months 26 days 17 years 4 months 20 days
Weighted average discount rate - operating leases (at period end) 3.17% 3.40%
Right-of-use assets obtained in exchange for new lease liabilities - operating leases $ 9,393 $ 38,881