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Indebtedness - Schedule of Required Principal Payments on Outstanding Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
2017 $ 42,675  
2018 251,488  
2019 1,580  
2020 451,674  
2021 25,982  
Thereafter 378,235  
Total $ 1,151,634 $ 1,711,666