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Leases (Details)
a in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 14, 2016
a
Operating Leased Assets [Line Items]      
Land Subject to Ground Leases | a     0
Amortization of Below Market Lease $ 0.1 $ 0.1  
Below Market Lease, Amortization Income, Next Twelve Months 0.1    
Below Market Lease, Amortization Income, Year Two 0.1    
Below Market Lease, Amortization Income, Year Three 0.1    
Below Market Lease, Amortization Income, Year Four 0.1    
Below Market Lease, Amortization Income, Year Five $ 0.1    
Office Building [Member] | Minimum [Member]      
Operating Leased Assets [Line Items]      
Lessee, Operating Lease, Term of Contract 5 years    
Office Building [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Lessee, Operating Lease, Term of Contract 8 years    
Equipment [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Lessee, Operating Lease, Term of Contract 5 years