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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]      
Additional term of contract   100 years  
Supplemental Statements of Operations Information      
Operating lease costs $ 1,705 $ 3,416  
Short-term lease costs 10 20  
Variable lease costs 114 256  
Total lease costs 1,829 3,692  
Operating cash outflows from operating leases   3,504  
ROU assets obtained in exchange for operating lease liabilities   44,354  
Operating Lease Liabilities      
2019 (remaining six months) 3,449 3,449  
2020 6,916 6,916  
2021 6,942 6,942  
2022 6,999 6,999  
2023 5,612 5,612  
Thereafter 30,806 30,806  
Total future minimum operating lease payments 60,724 60,724  
Less: imputed interest (13,893) (13,893)  
Operating lease liabilities 46,831 46,831  
ROU asset $ 41,803 $ 41,803  
Weighted average remaining lease term 11 years 2 months 12 days 11 years 2 months 12 days  
Weighted average discount rate 4.30% 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 1 year  
Maximum      
Lessee, Lease, Description [Line Items]      
Term of contract 50 years 50 years