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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease ROU assets $ 32,900  
Net Lease Cost [Abstract]    
Operating lease cost 1,799  
Variable lease cost 677  
Short-term lease cost 90  
Sublease income (101)  
Total operating lease cost 2,465  
Future Minimum Rental Commitments [Abstract]    
2019 5,197  
2020 6,541  
2021 5,689  
2022 4,880  
2023 4,034  
Thereafter 13,874  
Total lease payments 40,215  
Less: interest (4,838)  
Present value of lease liabilities $ 35,377  
Additional Information Related to Operating Leases [Abstract]    
Weighted average remaining lease term, in years 7 years 10 months 13 days  
Weighted average discount rate 3.05%  
Cash paid for amounts included in the measurement of lease liabilities [Abstract]    
Operating cash flows from operating leases $ 1,549  
ROU assets obtained in exchange for lease liabilities $ 34,427  
Future Minimum Rental Payments [Abstract]    
2019   $ 6,890
2020   6,467
2021   5,613
2022   4,773
2023   3,972
Thereafter   13,869
Total   $ 41,584