Fair Value Disclosures (Details 2) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Investments-trading [Member] | Equity securities [Member]
Quantitative information about level 3 fair value measurements
Fair Value	$ 63
Weighted average, Expected Life	5 years
Weighted average, Volatility	25.00%
Weighted average, Dividend Yield	0.00%
Range of Significant Inputs, Expected Life	5 years
Range of Significant Inputs, Volatility	25.00%
Range of Significant Inputs, Dividend Yield	0.00%
Other investments, at fair value [Member] | Other securities [Member]
Quantitative information about level 3 fair value measurements
Weighted average, Volatility	25.00%
Weighted average, Dividend Yield	0.00%
Range of Significant Inputs, Volatility	25.00%
Range of Significant Inputs, Dividend Yield	0.00%
Other investments, at fair value [Member] | Equity securities [Member] | Other securities [Member]
Quantitative information about level 3 fair value measurements
Fair Value	88
Weighted average, Expected Life	5 years 2 months 12 days
Other investments, at fair value [Member] | Equity securities [Member] | Other securities [Member] | Minimum [Member]
Quantitative information about level 3 fair value measurements
Range of Significant Inputs, Expected Life	5 years
Other investments, at fair value [Member] | Equity securities [Member] | Other securities [Member] | Maximum [Member]
Quantitative information about level 3 fair value measurements
Range of Significant Inputs, Expected Life	10 years
Other investments, at fair value [Member] | Equity securities [Member] | Other Investment Vehicles [Member] | Star Asia [Member]
Quantitative information about level 3 fair value measurements
Fair Value	$ 32,299
Weighted average, Discount rate on debt	7.15%
Range of Significant Inputs, Discount rate on debt	7.15%