Investments, Realized Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Realized gains (losses) [Abstract]
Total realized gains	$ 2,073	$ 694	$ 5,162	$ 4,546
Fair Value at Sale of securities with realized gains	26,069	18,055	81,854	51,252
Total realized losses	(947)	(35)	(1,419)	(499)
Fair Value at Sale of securities with realized losses	13,050	1,745	43,885	9,972
Net realized gains (losses) on investments	1,126	659	3,743	4,047
Fair Value of Investments at Sale	39,119	19,800	125,739	61,224
Debt Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	226	241	973	533
Fair Value at Sale of securities with realized gains	21,843	16,413	71,869	38,657
Total realized losses	(178)	(20)	(504)	(118)
Fair Value at Sale of securities with realized losses	9,744	1,627	39,926	8,333
Equity Securities [Member]
Realized gains (losses) [Abstract]
Total realized gains	1,847	453	4,189	4,013
Fair Value at Sale of securities with realized gains	4,226	1,642	9,985	12,595
Total realized losses	(769)	(15)	(915)	(381)
Fair Value at Sale of securities with realized losses	$ 3,306	$ 118	$ 3,959	$ 1,639