Fair Value Measurement Level 3 Reconciliation (Details) - Unobservable Inputs (Level 3) - Private Equity Funds [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,785	$ 717	$ 1,785	$ 750
Total unrealized (losses) gains included in earnings relating to assets still held at the reporting date	(13)	105	(13)	72
Purchases	0	1,000	0	1,000
Ending balance	$ 1,772	$ 1,822	$ 1,772	$ 1,822