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Commitments and Contingencies (Future Minimum Rental Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
2017 $ 1,339    
2018 1,595    
2019 1,595    
2020 1,595    
2021 1,595    
2022 though 2067 34,379    
Total 42,098    
Other Expenses      
Operating ground lease expense $ 1,000 $ 815 $ 454