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Leases (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
Quantitative Lease Disclosures [Abstract]          
Renewal option period 5 years   5 years    
Assets [Abstract]          
Operating lease right-of-use assets $ 39,095   $ 39,095   $ 29,958
Liabilities [Abstract]          
Sundry payables and accrued expenses 9,851   9,851   8,719
Noncurrent operating lease liabilities 30,495   30,495   22,450
Total operating lease liabilities $ 40,346   $ 40,346   $ 31,169
Operating Leases [Abstract]          
Weighted average remaining lease term 5 years 2 months 12 days   5 years 2 months 12 days   5 years
Weighted average discount rate 3.20%   3.20%   3.60%
Lease Expense [Abstract]          
Operating lease expense [1] $ 2,441 $ 2,303 $ 4,777 $ 4,616  
Excluded expenses of non lease 300 $ 500 900 900  
Cash Paid for the amounts included in the measurement of lease liabilities [Abstract]          
Operating cash flows from operating leases     4,733 4,544  
Right-of-use assets obtained in exchange for new lease obligations [Abstract]          
Operating leases     14,077 $ 380  
Minimum Lease Payments [Abstract]          
2021 5,110   5,110    
2022 9,681   9,681    
2023 8,700   8,700    
2024 6,370   6,370    
2025 5,248   5,248    
Thereafter 8,835   8,835    
Total lease payments 43,944   43,944    
Less: Interest (3,598)   (3,598)    
Total operating lease liabilities $ 40,346   $ 40,346   $ 31,169
Maximum [Member]          
Quantitative Lease Disclosures [Abstract]          
Remaining operating lease terms 10 years   10 years    
[1] Excludes expenses of approximately $0.3 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and approximately $0.5 million and $0.9 million for the comparable periods in 2020, 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.