Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues [Abstract]
Revenues	$ 118,285	$ 102,946	$ 357,309	$ 294,412
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	6,660	12,075	42,062	19,256
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	81,341	68,302	222,900	213,507
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	14,766	2,452	33,161	20,980
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	16,344	19,857	52,027	57,979
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	62	7,264	3,626	11,239
Personal Segment [Member]
Revenues [Abstract]
Revenues	22,943	9,355	65,542	24,891
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	(740)	684	3,274	661
Corporate [Member]
Revenues [Abstract]
Revenues	(2,343)	5,432	16,840	(1,965)
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	$ (7,428)	$ 1,675	$ 2,001	$ (13,624)