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Fair Value - Private Equity Level 3 Fair Value Measurements (Details) - Private Equity Technology Media and Telecommunications [Member] - Fair Value, Measurements, Recurring [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Minimum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revenue multiple 2.5
Maximum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Revenue multiple 4.8
Fair Value, Inputs, Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value $ 9,527
Valuation technique Market comparable companies
Marketability discount 30.00%