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Commitments and Contingencies - Operating Lease Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lessee, Lease, Description [Line Items]    
Right-of-use asset $ 50,800  
Operating lease, liability $ 23,717  
Weighted average remaining lease term 34 years 12 days  
Weighted average discount rate 4.33%  
Payments $ 1,300  
Operating Lease, Expense $ 300  
Rent expense   $ 400
Minimum    
Lessee, Lease, Description [Line Items]    
Term of contract 16 years  
Maximum    
Lessee, Lease, Description [Line Items]    
Term of contract 85 years