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Marketable Securities and Derivative Instruments: Marketable Securities (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended							6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011 JC Penney [Member]	Dec. 31, 2010 JC Penney [Member]	Jun. 30, 2011 Other Equity Securities [Member]	Dec. 31, 2010 Other Equity Securities [Member]	Jun. 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	$ 122,956
Available-for-sale Securities, Gross Realized Gain (Loss)	48	3,797	2,139	3,908
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities						641,892	600,449	35,413	47,399
Available-for-sale Securities, Debt Securities										114,371	118,268
Marketable securities	791,676		791,676		766,116
Available-for-sale Equity Securities, Amortized Cost Basis						590,366	590,215	13,561	26,632
Available-for-sale Debt Securities, Amortized Cost Basis										101,816	104,180
Available For Sale Securities Amortized Cost	705,743		705,743		721,027
Aggregate unrealized gains	$ 85,933		$ 85,933		$ 45,089	$ 51,526	$ 10,234	$ 21,852	$ 20,767	$ 12,555	$ 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