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Mortgage Notes Payable - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Disclosure [Abstract]          
Mortgage notes payable which could become recourse $ 13,500   $ 13,500   $ 13,500
Interest expense capitalized 2,562 $ 3,837 4,865 $ 6,466  
Fair value of mortgage notes payable $ 3,946,754   $ 3,946,754   $ 4,628,781