Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Additional significant financial information for these segments
Policy acquisition expenses amortized	$ 93,817	$ 84,643	$ 79,519
Income tax expense (benefit)	41,870	43,173	45,307
Property and casualty [Member]
Additional significant financial information for these segments
Policy acquisition expenses amortized	71,327	68,516	63,768
Income tax expense (benefit)	13,944	12,740	10,849
Annuity [Member]
Additional significant financial information for these segments
Policy acquisition expenses amortized	14,781	7,957	6,868
Income tax expense (benefit)	21,319	18,531	19,046
Life [Member]
Additional significant financial information for these segments
Policy acquisition expenses amortized	7,709	8,170	8,883
Income tax expense (benefit)	9,432	10,919	12,305
Corporate and other [Member]
Additional significant financial information for these segments
Income tax expense (benefit)	$ (2,825)	$ 983	$ 3,107