Fair Value Measurement Level 3 Reconciliation (Details) - Unobservable Inputs (Level 3) - Private Equity Funds - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 2,588	$ 1,785	$ 2,595	$ 1,785
Total unrealized losses included in earnings relating to assets still held at the reporting date	(15)	(13)	(22)	(13)
Ending balance	$ 2,573	$ 1,772	$ 2,573	$ 1,772