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Investment in Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Investment in Marketable Securities (Textual) [Abstract]
Investment in marketable securities	$ 323,461		$ 289,365
Impairment on securities included as a component of realized gain (loss)	252,707		245,131
Net accumulated other comprehensive income	70,754		44,234
Gross unrealized losses	2,203		9,990
Impairment charges on available for sale securities	1,899	0
Dividend income recognized	$ 9,775	$ 8,406

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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