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Investment in Unconsolidated Ventures Aggregate Principal Payments of Recourse and Non-recourse Debt Payable to Third-parties (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity Method Investments and Joint Ventures [Abstract]      
Loss on real estate venture formation $ 0 $ (950) $ (222)
Schedule of Equity Method Investments [Line Items]      
2014 232,375    
2015 409,654    
2016 467,705    
2017 330,323    
2018 336,954    
Thereafter 822,454    
Equity Method Investment Summarized Financial Information Debt 699,860    
Equity Method Investments [Member]
     
Schedule of Equity Method Investments [Line Items]      
2014 11,940    
2015 191,304    
2016 42,180    
2017 13,937    
2018 229,780    
Thereafter 210,719    
Equity Method Investment Summarized Financial Information Debt $ 699,860