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Debt - Schedule of Maturities of Long-term Debt (Details) - Mortgages [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 amortization $ 4,417  
2019 amortization 3,790  
2020 amortization 3,938  
2021 amortization 4,090  
2022 amortization 5,455  
Thereafter 37,890  
Total amortization 59,580  
2018 maturities 262,195  
2019 maturities 250,000  
2020 maturities 0  
2021 maturities 0  
2022 maturities 265,000  
Thereafter 864,449  
Total maturities 1,641,644  
2018 266,612  
2019 253,790  
2020 3,938  
2021 4,090  
2022 270,455  
Thereafter 902,339  
Total $ 1,701,224 $ 1,617,840