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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements Tables [Abstract]  
Schedule of Fair Values of Financial Assets and Liabilities by Levels Table
    As of December 31, 2011 
  (Amounts in thousands)Total Level 1 Level 2 Level 3 
  Marketable securities $ 741,321 $ 741,321 $ - $ - 
  Real Estate Fund investments (75% of which is attributable to            
   noncontrolling interests)  346,650   -   -   346,650 
  Deferred compensation plan assets (included in other assets)  95,457   39,236   -   56,221 
  Derivative positions in marketable equity securities            
   (included in other assets)  30,600   -   30,600   - 
   Total assets$ 1,214,028 $ 780,557 $ 30,600 $ 402,871 
                
  Mandatorily redeemable instruments (included in other liabilities)$ 54,865 $ 54,865 $ - $ - 
                
    As of December 31, 2010 
  (Amounts in thousands)Total Level 1 Level 2 Level 3 
  Marketable securities $ 766,116 $ 766,116 $ - $ - 
  Real Estate Fund investments (75% of which is attributable to            
   noncontrolling interests)  144,423   -   -   144,423 
  Deferred compensation plan assets (included in other assets)  91,549  43,699   -   47,850 
  Derivative positions in marketable equity securities            
   (included in other assets)  17,616   -   17,616   - 
   Total assets$ 1,019,704 $ 809,815 $ 17,616 $ 192,273 
                
  Mandatorily redeemable instruments (included in other liabilities)$ 55,097 $55,097 $ - $ - 
Summary of Changes in Level 3 Deferred Compensation Plan Assets Table
    Real Estate Fund Investments Deferred Compensation Plan Assets 
    For The Year Ended December 31, For The Year Ended December 31, 
  (Amounts in thousands) 2011 2010 2011 2010 
 Beginning balance $ 144,423 $ - $ 47,850 $ 39,589 
 Purchases   248,803   144,423   25,692   17,006 
 Sales   (48,355)   -   (18,801)   (12,320) 
 Realized and unrealized gains   17,386   -   1,232   3,527 
 Other, net   (15,607)   -   248   48 
 Ending balance $ 346,650 $ 144,423 $ 56,221 $ 47,850 
Non-financial Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block]
    As of December 31, 2011 
  (Amounts in thousands)Total Level 1 Level 2 Level 3 
  Real estate assets$ 62,033 $ - $ - $ 62,033 
                
                
    As of December 31, 2010 
  (Amounts in thousands)Total Level 1 Level 2 Level 3 
  Real estate assets$ 381,889 $ - $ - $ 381,889 
  Investments in partially owned entities  11,413   -   -   11,413 
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments
    As of December 31, 2011 As of December 31, 2010 
    Carrying  Fair Carrying  Fair 
 (Amounts in thousands)Amount Value Amount Value 
  Mezzanine loans receivable$ 133,948 $ 128,581 $ 202,412 $ 197,581 
  Debt:            
   Notes and mortgages payable$ 8,558,275 $ 8,685,619 $ 8,255,101 $ 8,446,791 
   Senior unsecured notes  1,357,661   1,426,406   1,082,928   1,119,512 
   Exchangeable senior debentures  497,898   509,982   491,000   554,355 
   Convertible senior debentures  10,168   10,220   186,413   191,510 
   Revolving credit facility debt  138,000   138,000   874,000   874,000 
    $ 10,562,002 $ 10,770,227 $ 10,889,442 $ 11,186,168