Marketable Securities and Derivative Instruments: Derivative Instruments (Details) (JC Penney [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Investment Owned Balance Shares	23,400,000
Ownership Percentage	10.70%
Investment Owned, at Cost	$ 591,228,000
Closing share price	$ 19.71
Shares Owned [Member]
Derivative [Line Items]
Investment Owned Balance Shares	18,584,010
Acquisiton Price Per Share	$ 25.76
Investment Owned, at Cost	478,691,000
Investment Owned At Fair Value	366,291,000
Equity Contract [Member]
Derivative [Line Items]
Investment Owned Balance Shares	15,500,000
Derivative Gain On Derivative	112,537,000
Forward Contracts [Member]
Derivative [Line Items]
Unrealized Gain Loss On Securities	75,815,000	12,984,000	17,616,000
Forward Contracts [Member] | October 2010 [Member]
Derivative [Line Items]
Derivative Inception Dates	Oct. 08, 2012
Derivative Number Of Instruments Held	4,815,990
Derivative Price Risk Option Strike Price	29.10
Derivative Maturity Dates	Oct. 09, 2014
Notional Amount Of Price Risk Derivatives	$ 140,138,000