Fair Value - Private Equity Level 3 Fair Value Measurements (Details) - Private Equity Technology Media and Telecommunications [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revenue multiple	2.5	2.0
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Revenue multiple	4.8	3.5
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 9,527	$ 20,112
Valuation technique	Market comparable companies	Market comparable companies
Discount rate		18.00%
Discount years		2 years
Marketability discount	30.00%