Fair Value Measurement Level 3 Reconciliation (Details) - Unobservable Inputs (Level 3) - Private Equity Funds [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,772	$ 1,822	$ 1,785	$ 750
Total unrealized gains (losses) included in earnings relating to assets still held at the reporting date	836	(24)	823	48
Purchases	0	0	0	1,000
Ending balance	$ 2,608	$ 1,798	$ 2,608	$ 1,798