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Acquisitions - Remeasurement Gain (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Sep. 17, 2013
Camelback Colonnade
Oct. 24, 2013
Superstition Springs Land I
Oct. 24, 2013
Superstition Springs Land I
Sep. 16, 2013
Camelback Colonnade
Acquisition            
Fair value of existing ownership interest (at % ownership)     $ 41,690 $ 47,340    
Investments in unconsolidated joint ventures (797,010) (701,483) (5,349)   (32,476)  
Remeasurement gain     $ 36,341 $ 14,864    
Ownership interest before acquisition (as a percent)         66.70% 73.20%