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Other Investments (Real estate equity investments) (Details) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Land
Sep. 30, 2012
Land
Sep. 30, 2013
Real estate equity investments
Sep. 30, 2012
Real estate equity investments
Sep. 30, 2013
Real estate equity investments
Sep. 30, 2012
Real estate equity investments
Dec. 31, 2012
Real estate equity investments
Sep. 30, 2013
Real estate equity investments
Land
Sep. 30, 2013
Real estate equity investments
Land
Jun. 30, 2013
Real estate equity investments
Land
Sep. 30, 2013
Real estate equity investments
Net Lease
Dec. 31, 2012
Real estate equity investments
Net Lease
Sep. 30, 2013
Real estate equity investments
Operating Properties
Sep. 30, 2012
Real estate equity investments
Operating Properties
Sep. 30, 2013
Real estate equity investments
Operating Properties
Sep. 30, 2012
Real estate equity investments
Operating Properties
Dec. 31, 2012
Real estate equity investments
Operating Properties
Sep. 30, 2013
Real estate equity investments
Land Assets
Dec. 31, 2012
Real estate equity investments
Land Assets
Sep. 30, 2013
Minimum
Real estate equity investments
Sep. 30, 2013
Maximum
Real estate equity investments
Schedule of Equity Method Investments [Line Items]                                                    
Property sold, aggregate, carrying value           $ 8,600,000 $ 64,500,000             $ 21,400,000                        
iStar's ownership percentage                         47.50% 47.50%       33.00%   33.00%         31.00% 70.00%
Equity method investments 179,877,000   179,877,000   387,718,000     45,927,000   45,927,000   47,619,000 12,200,000 12,200,000   16,400,000 16,400,000 16,700,000   16,700,000   25,700,000 600,000 5,500,000    
Equity method investment, carryover basis                             10,600,000                      
Amount of cash contributed in exchange for equity interest                         1,600,000                          
Earnings from equity method investments $ 4,345,000 $ 22,719,000 $ 34,346,000 $ 75,925,000       $ (966,000) $ 2,219,000 $ 1,755,000 $ 17,709,000             $ 500,000 $ 4,000,000 $ 4,500,000 $ 22,200,000