v2.4.0.6
Debt (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Short and Long Term Debt [Line Items]    
Amount Outstanding $ 12,433,585 $ 11,382,408
Weighted Average Interest Rate 4.35% 5.12%
Credit Facilities [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 1,138,414 936,796
Weighted Average Interest Rate 1.66% 2.17%
Senior notes [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 4,684,152 4,772,607
Weighted Average Interest Rate 5.74% 6.30%
Exchangeable senior notes [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 877,776 1,315,448
Weighted Average Interest Rate 4.56% 4.82%
Secured mortgage debt [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 3,115,437 1,699,363
Weighted Average Interest Rate 3.78% 4.71%
Secured mortgage debt of consolidated entities [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 1,366,837 1,495,047
Weighted Average Interest Rate 4.49% 4.54%
Other debt of consolidated entities [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding 602,938 775,763
Weighted Average Interest Rate 4.45% 5.30%
Other debt [Member]
    
Short and Long Term Debt [Line Items]    
Amount Outstanding $ 648,031 $ 387,384
Weighted Average Interest Rate 2.15% 2.44%