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Leases - Balance Sheet Disclosures and Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Leases [Abstract]      
Right of Use Asset $ 39,729   $ 41,254
Operating lease liability $ 47,726   $ 49,367
Weighted-average remaining lease term-operating leases (Year) 7 years 4 months 24 days   8 years
Weighted average discount rate-operating leases 3.80%   3.80%
Operating lease cost $ 1,885 $ 1,892  
Short-term lease cost 34 34  
Variable lease cost 264 246  
Total lease cost 2,183 2,172  
Operating cash flows from operating leases 1,982 2,025  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 23 $ 21