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Marketable Securities and Derivative Instruments: Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
JC Penney [Member]
Dec. 31, 2011
JC Penney [Member]
Sep. 30, 2012
Other Equity Securities [Member]
Dec. 31, 2011
Other Equity Securities [Member]
Dec. 31, 2011
Debt Securities [Member]
Sep. 30, 2012
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]                  
Available-for-sale Securities, Equity Securities       $ 451,406 $ 653,228 $ 33,595 $ 30,568    
Available-for-sale Securities, Debt Securities               57,525 0
Marketable Securities, Total 485,001   741,321            
Available-for-sale Equity Securities, Amortized Cost Basis       591,214 591,069 14,228 14,585    
Available-for-sale Debt Securities, Amortized Cost Basis               53,941 0
Available For Sale Securities Amortized Cost 605,442   659,595            
Aggregate unrealized gain (loss) (120,441)   81,726 (139,808) 62,159 19,367 15,983 3,584 0
Available-for-sale Securities, Debt Maturity, Date Range, Low               04/13  
Available-for-sale Securities, Debt Maturity, Date Range, High               10/18  
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]                  
Available For Sale Securities Gross Realized Gains Losses Sale Proceeds 58,460 19,301              
Available-for-sale Securities, Gross Realized Gain (Loss) $ 3,582 $ 2,139