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Mortgage Notes Payable - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Disclosure [Abstract]          
Interest expense capitalized $ 4,670 $ 3,343 $ 9,001 $ 5,977  
Fair value of mortgage notes payable $ 4,229,459   $ 4,229,459   $ 4,250,816