For an unclassified balance sheet, this item represents equity securities categorized neither as held-to-maturity nor trading.

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+ Details

Marketable Securities Realized and Unrealized Gain and Losses on Marketable Securities (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Sales Transaction of Marketable Securities, Unrealized Gain (Loss) [Abstract]
Equity Securities Carrying Value						$ 51,300,000
Available-for-sale Securities, Gross Unrealized Gains, Before Tax						24,000,000
Available-for-sale Securities, Gross Unrealized Gains, After Tax						14,800,000
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds		51,900,000
Available-for-sale Securities, Gross Realized Gains	0	24,900,000		24,900,000	400,000
Available-for-sale Securities, Gross Realized Losses	$ 0		$ (100,000)