Marketable Securities and Derivative Instruments: Derivative Instrument (Details) (JC Penney [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Investment Owned Balance Shares	23,400,000
Ownership Percentage	11.00%
Investment Owned, at Cost		$ 591,069,000
Closing share price	$ 35.15	$ 32.31
Maximum Ownership Percentage Per Agreement	15.40%
Voting Ownership Interest Percentage Per Agreement	9.90%
Shares Owned [Member]
Derivative [Line Items]
Investment Owned Balance Shares	18,584,010
Acquisiton Price Per Share	$ 25.75
Investment Owned, at Cost	478,532,000
Unrealized Gain Loss On Securities	51,925,000
Investment Owned At Fair Value	653,228,000
Equity Contract [Member] | September 2010 [Member]
Derivative [Line Items]
Investment Owned Balance Shares		15,500,000
Acquisiton Price Per Share		$ 31.81
Derivative Inception Dates		Sep. 28, 2010
Derivative Gain On Derivative		112,537,000
Derivative Maturity Dates		Nov. 09, 2010
Forward Contracts [Member]
Derivative [Line Items]
Unrealized Gain Loss On Securities	12,984,000	17,616,000
Forward Contracts [Member] | October 2010 [Member]
Derivative [Line Items]
Derivative Inception Dates	Oct. 07, 2010
Derivative Number Of Instruments Held	4,815,990
Derivative Price Risk Option Strike Price	$ 28.80
Derivative Maturity Dates	Oct. 09, 2012
Notional Amount Of Price Risk Derivatives	$ 138,682,000
Derivative Basis Spread On Variable Rate	0.80%