Investments, Realized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Realized gains (losses) [Abstract]
Total realized gains	$ 1,180	$ 2,106	$ 3,088	$ 3,852
Fair Value at Sale of securities with realized gains	17,301	18,714	55,691	33,197
Total realized losses	(267)	(50)	(471)	(464)
Fair Value at Sale of securities with realized losses	15,842	3,190	30,928	8,227
Net realized gains (losses) on investments	913	2,056	2,617	3,388
Fair Value of Investments at Sale	33,143	21,904	86,619	41,424
Debt Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	265	157	746	292
Fair Value at Sale of securities with realized gains	14,626	12,576	49,932	22,244
Total realized losses	(224)	(28)	(326)	(98)
Fair Value at Sale of securities with realized losses	15,649	3,007	30,275	6,706
Equity Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	915	1,949	2,342	3,560
Fair Value at Sale of securities with realized gains	2,675	6,138	5,759	10,953
Total realized losses	(43)	(22)	(145)	(366)
Fair Value at Sale of securities with realized losses	$ 193	$ 183	$ 653	$ 1,521