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Marketable Securities and Derivative Instruments: Marketable Securities (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
JC Penney [Member]
Dec. 31, 2011
JC Penney [Member]
Jun. 30, 2012
Other Equity Securities [Member]
Dec. 31, 2011
Other Equity Securities [Member]
Dec. 31, 2011
Debt Securities [Member]
Jun. 30, 2012
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]                      
Available-for-sale Securities, Equity Securities           $ 433,193 $ 653,228 $ 33,406 $ 30,568    
Available-for-sale Securities, Debt Securities                   57,525 0
Marketable Securities, Total 466,599   466,599   741,321            
Available-for-sale Equity Securities, Amortized Cost Basis           591,214 591,069 14,183 14,585    
Available-for-sale Debt Securities, Amortized Cost Basis                   53,941 0
Available For Sale Securities Amortized Cost 605,397   605,397   659,595            
Aggregate unrealized gain (loss) (138,798)   (138,798)   81,726 (158,021) 62,159 19,223 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 $ 48 $ 3,582 $ 2,139