Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues [Abstract]
Revenues	$ 120,903	$ 98,125	$ 239,024	$ 191,466
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	16,484	6,372	35,402	7,181
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	73,592	72,081	141,559	145,205
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	10,427	8,770	18,395	18,528
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	17,310	19,247	35,683	38,122
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	2,057	2,656	3,564	3,975
Personal Segment [Member]
Revenues [Abstract]
Revenues	23,116	7,916	42,599	15,536
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	2,441	(1)	4,014	(23)
Corporate [Member]
Revenues [Abstract]
Revenues	6,885	(1,119)	19,183	(7,397)
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	$ 1,559	$ (5,053)	$ 9,429	$ (15,299)