Investments (Proceeds from Sales of Securities and Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments [Abstract]
Proceeds	$ 9,578	$ 47,637	$ 24,667	$ 56,222
Realized gains	140	1,210	156	1,305
Realized losses	$ 60	$ 196	$ 173	$ 359