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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Quantitative Lease Disclosures [Abstract]          
Renewal option period 5 years   5 years    
Assets [Abstract]          
Operating lease right-of-use assets $ 30,910   $ 30,910   $ 36,020
Liabilities [Abstract]          
Sundry payables and accrued expenses 8,648   8,648   8,739
Noncurrent operating lease liabilities 23,452   23,452   28,376
Total operating lease liabilities $ 32,100   $ 32,100   $ 37,115
Operating Leases [Abstract]          
Weighted average remaining lease term 5 years 1 month 6 days   5 years 1 month 6 days   5 years 7 months 6 days
Weighted average discount rate 3.70%   3.70%   3.70%
Lease Expense [Abstract]          
Operating lease expense [1] $ 2,290 $ 2,199 $ 6,906 $ 6,633  
Excluded expenses of non lease 700 $ 800 1,600 1,900  
Cash Paid for the amounts included in the measurement of lease liabilities [Abstract]          
Operating cash flows from operating leases     6,810 6,490  
Right-of-use assets obtained in exchange for new lease obligations [Abstract]          
Operating leases     611 $ 856  
Minimum Lease Payments [Abstract]          
2020 2,235   2,235    
2021 8,631   8,631    
2022 7,071   7,071    
2023 5,715   5,715    
2024 3,881   3,881    
Thereafter 7,844   7,844    
Total lease payments 35,377   35,377    
Less: Interest (3,277)   (3,277)    
Present value of lease liabilities $ 32,100   $ 32,100   $ 37,115
Maximum [Member]          
Quantitative Lease Disclosures [Abstract]          
Remaining operating lease terms 10 years   10 years    
[1] Excludes expenses of approximately $0.7 million and $1.6 million for the three and nine months ended September 30, 2020, respectively, and approximately $0.8 million and $1.9 million for the comparable periods in 2019, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material.