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Marketable Securities and Derivative Instruments: Marketable Securities (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended							9 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 JC Penney [Member]	Dec. 31, 2010 JC Penney [Member]	Sep. 30, 2011 Other Equity Securities [Member]	Dec. 31, 2010 Other Equity Securities [Member]	Sep. 30, 2011 Debt Securities [Member]	Dec. 31, 2010 Debt Securities [Member]
Available-for-sale Securities, Gross Realized Gain (Loss), Disclosures [Abstract]
Available For Sale Securities Gross Realized Gains Losses Sale Proceeds			$ 19,301	$ 155,118
Available-for-sale Securities, Gross Realized Gain (Loss)	0	5,052	2,139	8,960
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities						497,680	600,600	26,769	47,248
Available-for-sale Securities, Debt Securities										106,912	118,268
Marketable securities	631,361		631,361		766,116
Available-for-sale Equity Securities, Amortized Cost Basis						590,366	590,366	13,561	26,481
Available-for-sale Debt Securities, Amortized Cost Basis										102,679	104,180
Available For Sale Securities Amortized Cost	706,606		706,606		721,027
Aggregate unrealized gains	$ (75,245)		$ (75,245)		$ 45,089	$ (92,686)	$ 10,234	$ 13,208	$ 20,767	$ 4,233	$ 14,088
Available-for-sale Securities, Debt Maturity, Date Range, Low										04/13	08/11
Available-for-sale Securities, Debt Maturity, Date Range, High										10/18	10/18