Investments - Other Investments - Related Party (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Steel Excel Inc.
Schedule of Equity Method Investments [Line Items]
Receivable	$ 3,000
WebBank
Schedule of Equity Method Investments [Line Items]
Held to maturity securities	8,707	$ 6,558
Maturities between years three and ten	8,707
Fair value	8,757	$ 6,551
Venture Capital Funds | Steel Excel Inc.
Schedule of Equity Method Investments [Line Items]
Investment in venture capital fund	400
Preferred Stock | Steel Excel Inc.
Schedule of Equity Method Investments [Line Items]
Investment in venture capital fund	$ 100
Minimum | WebBank
Schedule of Equity Method Investments [Line Items]
Held-to-maturity securities, maturity period	3 years
Maximum | WebBank
Schedule of Equity Method Investments [Line Items]
Held-to-maturity securities, maturity period	10 years