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Debt - Schedule of Maturities of Long-term Debt (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
In-Substance Defeased Debt  
Debt Instrument [Line Items]  
Remaining 2018 $ 780
2019 3,193
2020 3,323
2021 3,494
2022 128,213
Thereafter 0
Total 139,003
Notes Payable, Excluding Defeased Debt  
Debt Instrument [Line Items]  
Remaining 2018 138
2019 5,569
2020 440,095
2021 632
2022 610,085
Thereafter 1,294,000
Total $ 2,350,519