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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Quantitative Lease Disclosures [Abstract]    
Renewal option period 5 years  
Assets [Abstract]    
Operating lease right-of-use assets $ 37,301 $ 0
Liabilities [Abstract]    
Sundry payables and accrued expenses 8,148  
Noncurrent operating lease liabilities 30,130 $ 0
Present value of lease liabilities 38,278  
Lease Expense [Abstract]    
Operating lease expense [1] 2,224  
Cash Paid for the amounts included in the measurement of lease liabilities [Abstract]    
Operating cash flows from operating leases 2,161  
Right-of-use assets obtained in exchange for new lease obligations [Abstract]    
Operating leases $ 566  
Operating Leases [Abstract]    
Weighted average remaining lease term 6 years 3 months 18 days  
Weighted average discount rate 3.80%  
Minimum Lease Payments [Abstract]    
2019 $ 6,413  
2020 7,597  
2021 6,983  
2022 5,785  
2023 5,277  
Thereafter 11,316  
Total lease payments 43,371  
Less: Interest (5,093)  
Present value of lease liabilities $ 38,278  
Maximum [Member]    
Quantitative Lease Disclosures [Abstract]    
Remaining operating lease terms 10 years  
[1] Excludes expenses 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.