Investments (Proceeds from Sales of Securities and Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments [Abstract]
Proceeds	$ 28,005	$ 616	$ 52,672	$ 56,838
Realized gains	217	222	373	1,527
Realized losses	$ 138	$ 75	$ 311	$ 434