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Commitments and Contingencies (Future Minimum Rental Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]      
2018 $ 1,771    
2019 1,766    
2020 1,766    
2021 1,766    
2022 1,720    
2023 though 2067 33,160    
Total 41,949    
Other Expenses      
Operating ground lease expense $ 102 $ 1,000 $ 815