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Acquisitions - Reconciliation of Purchase Price to Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 17, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 14, 2014
Acquisition          
Investments in unconsolidated joint ventures   $ 1,709,522 $ 1,773,558    
Gain on remeasurement of assets   $ 0 $ 0 $ 22,089  
PPRLP Queens Portfolio [Member]          
Acquisition          
Ownership percentage at completion of acquisition (as a percent)         100.00%
Inland Center          
Acquisition          
Purchase price $ 51,250        
Less debt assumed (25,000)        
Investments in unconsolidated joint ventures 4,161        
Gain on remeasurement of assets 22,089        
Fair value of acquired net assets (at 100% ownership) $ 52,500        
Ownership percentage at completion of acquisition (as a percent) 100.00%