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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Additional term of contract 100 years  
Supplemental Statements of Operations Information    
Operating lease costs $ 1,711  
Short-term lease costs 10  
Variable lease costs 142  
Total lease costs 1,863  
Operating cash outflows from operating leases 1,797  
ROU assets obtained in exchange for operating lease liabilities 44,324  
Operating Lease Liabilities    
2019 (remaining nine months) 5,180  
2020 6,924  
2021 6,964  
2022 7,022  
2023 5,635  
Thereafter 30,912  
Total future minimum operating lease payments 62,637  
Less: imputed interest (14,441)  
Operating lease liabilities 48,196  
ROU asset $ 43,146  
Weighted average remaining lease term 11 years 3 months 18 days  
Weighted average discount rate 4.30%  
Minimum Annual Rental Commitments As Presented Under ASC 840    
2019   $ 6,929
2020   6,948
2021   7,157
2022   7,233
2023   5,827
Thereafter   43,876
Total minimum annual rental commitments   $ 77,970
Minimum    
Lessee, Lease, Description [Line Items]    
Term of contract 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Term of contract 50 years