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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Schedule of Fair Values of Financial Assets and Liabilities by Levels [Table Text Block]
    As of September 30, 2013 
 (Amounts in thousands)Total Level 1 Level 2 Level 3 
 Marketable securities $ 210,554 $ 210,554 $ - $ - 
 Real Estate Fund investments (75% of which is attributable to            
  noncontrolling interests)  635,990   -   -   635,990 
 Deferred compensation plan assets (included in other assets)  111,752   45,227   -   66,525 
  Total assets$ 958,296 $ 255,781 $ - $ 702,515 
                
 Mandatorily redeemable instruments (included in other liabilities)$ 55,097 $ 55,097 $ - $ - 
 Interest rate swap (included in other liabilities)  35,800   -   35,800   - 
  Total liabilities$ 90,897 $ 55,097 $ 35,800 $ - 
                
                
    As of December 31, 2012 
 (Amounts in thousands)Total Level 1 Level 2 Level 3 
 Marketable securities $ 398,188 $ 398,188 $ - $ - 
 Real Estate Fund investments (75% of which is attributable to            
  noncontrolling interests)  600,786   -   -   600,786 
 Deferred compensation plan assets (included in other assets)  105,200   42,569   -   62,631 
 J.C. Penney derivative position (included in other assets)(1)  11,165   -   11,165   - 
  Total assets$ 1,115,339 $ 440,757 $ 11,165 $ 663,417 
                
 Mandatorily redeemable instruments (included in other liabilities)$ 55,011 $ 55,011 $ - $ - 
 Interest rate swap (included in other liabilities)  50,065   -   50,065   - 
  Total liabilities$ 105,076 $ 55,011 $ 50,065 $ - 
                
                
 (1) Represents the cash deposited with the counterparty in excess of the mark-to-market loss on the derivative position. 
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Table Text Block]
    As of September 30, 2013 As of December 31, 2012 
    Carrying  Fair Carrying  Fair 
  (Amounts in thousands)Amount Value Amount Value 
  Cash equivalents$ 380,248 $ 380,248 $ 543,000 $ 543,000 
  Mortgage and mezzanine loans receivable  176,388   176,098   225,359   221,446 
    $ 556,636 $ 556,346 $ 768,359 $ 764,446 
  Debt:            
   Mortgages payable$ 8,566,582 $ 8,638,000 $ 8,644,200 $ 8,672,000 
   Senior unsecured notes  1,350,769   1,413,000   1,358,008   1,468,000 
   Revolving credit facility debt  83,982   83,982   1,170,000   1,170,000 
    $ 10,001,333 $ 10,134,982 $ 11,172,208 $ 11,310,000 
Non Financial Assets Measured At Fair Value On Nonrecurring Basis [Table Text Block]
    As of December 31, 2012 
  (Amounts in thousands)Total Level 1 Level 2 Level 3 
  Investment in Toys "R" Us$ 478,041 $ - $ - $ 478,041 
  Real estate assets  189,529   -   -   189,529 
  Condominium units (included in other assets)  52,142   -   -   52,142 
   Total assets$ 719,712 $ - $ - $ 719,712 
                
                
Real Estate Funds [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
        Weighted Average 
        (based on fair  
 Unobservable Quantitative Input Range value of investments) 
  Discount rates 12.0% to 17.5% 13.9% 
  Terminal capitalization rates 5.3% to 6.0% 5.7% 
          
Summary of Changes in Level 3 Plan Assets [Table Text Block]
    Real Estate Fund Investments Real Estate Fund Investments 
   For the Three Months Ended September 30, For the Nine Months Ended September 30, 
  (Amounts in thousands)  2013  2012 2013 2012 
 Beginning balance $ 622,124 $ 388,455 $ 600,786 $ 346,650 
 Purchases   7,406   88,429   38,299   163,021 
 Sales/Returns   (14,184)   -   (70,848)   (61,052) 
 Net realized gain   8,184   -   8,184   - 
 Net unrealized gains   12,367   5,558   59,476   33,537 
 Other, net   93   -   93   286 
 Ending balance $ 635,990 $ 482,442 $ 635,990 $ 482,442 
                
Deferred Compensation Plan Assets [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Summary of Changes in Level 3 Plan Assets [Table Text Block]
   Deferred Compensation Plan Assets Deferred Compensation Plan Assets 
    For the Three Months Ended September 30, For the Nine Months Ended September 30, 
 (Amounts in thousands)  2013  2012 2013 2012 
 Beginning balance $ 66,502 $ 58,313 $ 62,631 $ 56,221 
 Purchases   880   1,650   4,027   5,416 
 Sales   (873)   (276)   (5,318)   (4,287) 
 Realized and unrealized (loss) gain   (42)   1,080   4,094   3,349 
 Other, net   58   -   1,091   68 
 Ending balance $ 66,525 $ 60,767 $ 66,525 $ 60,767