Debt Security Investments (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
Oct. 31, 2012	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Debt Security Investments (Textual) [Abstract]
Special cash dividend declared per share	$ 0.15	$ 10.00	$ 10.00
Fair value of investment		$ 76,030	$ 76,030
Amortized cost		76,009	76,009
Unrealized gain on available for sale securities		13	13
Impairments on the debt security investments			$ 0	$ 0

Amount of debt securities categorized neither as held-to-maturity nor trading.

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- Definition

The amount by which the fair value of an investment 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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