Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues [Abstract]
Revenues	$ 123,133	$ 118,285	$ 356,833	$ 357,309
Pre-Tax Income (Loss) [Abstract]
Pre-tax (loss) income	(37,306)	6,660	(101,309)	42,062
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	86,589	81,341	269,833	222,900
Pre-Tax Income (Loss) [Abstract]
Pre-tax (loss) income	(26,751)	14,766	(4,577)	33,161
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	17,398	16,344	52,130	52,027
Pre-Tax Income (Loss) [Abstract]
Pre-tax (loss) income	(1,672)	62	(154)	3,626
Personal Segment [Member]
Revenues [Abstract]
Revenues	20,513	22,943	65,300	65,542
Pre-Tax Income (Loss) [Abstract]
Pre-tax (loss) income	(2,065)	(740)	(5,836)	3,274
Corporate [Member]
Revenues [Abstract]
Revenues	(1,367)	(2,343)	(30,430)	16,840
Pre-Tax Income (Loss) [Abstract]
Pre-tax (loss) income	$ (6,818)	$ (7,428)	$ (90,742)	$ 2,001