Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues [Abstract]
Revenues	$ 114,419	$ 101,048
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	11,700	(69,586)
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	71,965	92,120
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	11,821	16,292
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	17,688	17,636
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	366	716
Personal Segment [Member]
Revenues [Abstract]
Revenues	18,959	22,323
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	(1,623)	(5,655)
Corporate [Member]
Revenues [Abstract]
Revenues	5,807	(31,031)
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	$ 1,136	$ (80,939)