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Debt - Principal Repayments Required For Notes and Mortgages Payable and Revolving Credit Facility (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2019 $ 1,052
2020 4,304
2021 1,072,644
2022 1,030,100
Thereafter 1,475,000
Notes and Mortgages Payable [Member]  
Debt Instrument [Line Items]  
2019 1,052
2020 4,304
2021 1,072,644
2022 1,030,100
Thereafter $ 1,475,000