Investments (Proceeds from Sales of Securities and Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments [Abstract]
Proceeds	$ 14,820	$ 9,578	$ 25,591	$ 24,667
Realized gains	138	140	415	156
Realized losses	$ 117	$ 60	$ 188	$ 173