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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Quantitative Lease Disclosures [Abstract]          
Renewal option period 5 years   5 years    
Assets [Abstract]          
Operating lease right-of-use assets $ 32,536   $ 32,536   $ 36,020
Liabilities [Abstract]          
Sundry payables and accrued expenses 8,555   8,555   8,739
Noncurrent operating lease liabilities 25,148   25,148   28,376
Total operating lease liabilities $ 33,703   $ 33,703   $ 37,115
Operating Leases [Abstract]          
Weighted average remaining lease term 5 years 3 months 18 days   5 years 3 months 18 days   5 years 7 months 6 days
Weighted average discount rate 3.70%   3.70%   3.70%
Lease Expense [Abstract]          
Operating lease expense $ 2,303 [1] $ 2,210 $ 4,616 [1] $ 4,434 [1]  
Excluded expenses of non lease 500 $ 600 900 1,100  
Cash Paid for the amounts included in the measurement of lease liabilities [Abstract]          
Operating cash flows from operating leases     4,544 4,239  
Right-of-use assets obtained in exchange for new lease obligations [Abstract]          
Operating leases     380 $ 744  
Minimum Lease Payments [Abstract]          
2020 4,461   4,461    
2021 8,421   8,421    
2022 7,020   7,020    
2023 5,685   5,685    
2024 3,881   3,881    
Thereafter 7,844   7,844    
Total lease payments 37,312   37,312    
Less: Interest (3,609)   (3,609)    
Present value of lease liabilities $ 33,703   $ 33,703   $ 37,115
Maximum [Member]          
Quantitative Lease Disclosures [Abstract]          
Remaining operating lease terms 10 years   10 years    
[1] Excludes expenses of approximately $0.5 million and $0.9 million for the three and six months ended June 30, 2020, respectively, and approximately $0.6 million and $1.1 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.