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Debt - Schedule of Maturities of Long-term Debt (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Unsecured and Secured Debt  
Debt Instrument [Line Items]  
Remaining 2019 $ 424
2020 365,095
2021 632
2022 720,085
2023 160,000
Thereafter 1,489,001
Total 2,735,237
In-Substance Defeased Debt  
Debt Instrument [Line Items]  
Remaining 2019 2,387
2020 3,323
2021 3,494
2022 128,213
2023 0
Thereafter 0
Total 137,417
Joint Venture Partner Debt  
Debt Instrument [Line Items]  
Remaining 2019 0
2020 0
2021 0
2022 0
2023 0
Thereafter 66,136
Total $ 66,136