Fair Value Measurement Level 3 Reconciliation (Details) - Unobservable Inputs (Level 3) - Private Equity Funds - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 1,785	$ 750
Total unrealized gains included in earnings relating to assets still held at the reporting date	810	35
Purchases	0	1,000
Ending balance	$ 2,595	$ 1,785