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Acquisitions: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended 8 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Feb. 29, 2012
500 North Michigan Avenue:
sqft
Oct. 03, 2012
FlatIron Crossing
sqft
Oct. 26, 2012
Arrowhead Towne Center
sqft
Oct. 03, 2012
Arrowhead Towne Center
Jan. 03, 2013
Kings Plaza
Nov. 28, 2012
Kings Plaza
sqft
Jan. 31, 2013
Green Acres Mall
Jan. 24, 2013
Green Acres Mall
sqft
Sep. 30, 2013
Green Acres Mall
Dec. 31, 2012
Green Acres Mall
Apr. 25, 2013
Green Acres Adjacent
acre
Sep. 30, 2013
Camelback Colonnade
Sep. 17, 2013
Camelback Colonnade
Sep. 17, 2013
Camelback Colonnade
Sep. 16, 2013
Camelback Colonnade
Sep. 17, 2013
Camelback Colonnade
sqft
Acquisition                                          
Property area (in square feet)           327,000 1,435,000 1,196,000     1,199,000   1,792,000     19         619,000
Ownership percentage                                       73.20%  
Purchase price on acquisition           $ 70,925 $ 310,397 $ 144,400     $ 756,000   $ 500,000     $ 22,577          
Additional ownership interest acquired (as a percent)             75.00% 33.30%                     67.50%    
Amount of additional borrowing                   146,000 354,000 225,000 100,000                
Ownership interest before acquisition (as a percent)             25.00% 66.70%                          
Ownership interest at completion of acquisition (as a percent)             100.00%   100.00%                        
Purchase price funded by cash payment on acquisition             195,900 69,025     726,000                    
Purchase price funded by issuance of restricted common stock                     30,000                    
Deposits paid                             30,000            
Purchase price, balance remaining after deposit                         470,000                
Face amount of debt                     500,000   325,000                
Purchase price paid through assumption of debt by the Company     (109,858) 0     (114,497) (75,375)                          
Allocation of the fair value                                          
Property           66,033 443,391 423,349     714,589   477,673         98,160      
Deferred charges, net           7,450 25,251 31,500     37,371   45,130         8,284      
Restricted cash               4,009                   1,139      
Cash and cash equivalents             3,856                     1,280      
Tenant receivables               926                   615      
Other assets, net           2,143 2,101 4,234     29,282   19,125         380      
Total assets acquired           75,626 474,599 464,018     781,242   541,928         109,858      
Mortgage note payable             175,720 244,403                   49,465      
Accounts payable             366 815                   54      
Other accrued liabilities           4,701 11,071 10,449     25,242   41,928         4,752      
Total liabilities assumed           4,701 187,157 255,667     25,242   41,928         54,271      
Fair value of acquired net assets (at 100% ownership)           70,925 287,442 208,351     756,000   500,000         55,587      
Business combination                                          
Fair value of existing ownership interest (at % ownership)             91,542 139,326                   41,690      
Investments in unconsolidated joint ventures (706,450)   (706,450)   (974,258)   (33,382) (23,597)                   (5,349)      
Prior gain deferral recognized             (26,067)                            
Gain on remeasurement             84,227 115,729                   36,341      
Incremental revenue generated from acquired property                           47,564     521        
Incremental loss of acquired property                           (563)     (51)        
Pro forma information                                          
Total revenue 269,098 [1] 258,906 [1] 767,733 [1] 758,130 [1]                                  
Earnings $ 43,063 [1] $ 43,223 [1] $ 153,151 [1] $ 96,703 [1]                                  
[1] This unaudited pro forma supplemental information does not purport to be indicative of what the Company's operating results would have been had these transactions occurred on January 1, 2012, and may not be indicative of future operating results. The Company has excluded remeasurement gains and acquisition costs from these pro forma results as they are considered significant non-recurring adjustments directly attributable to these transactions.