Segment Information (Schedule of Business Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues [Abstract]
Revenues	$ 101,048	$ 118,121
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	(69,586)	18,918
Specialty Commercial Segment [Member]
Revenues [Abstract]
Revenues	92,120	67,967
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	16,292	7,968
Standard Commercial Segment [Member]
Revenues [Abstract]
Revenues	17,636	18,373
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	716	1,507
Personal Segment [Member]
Revenues [Abstract]
Revenues	22,323	19,483
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	(5,655)	1,573
Corporate [Member]
Revenues [Abstract]
Revenues	(31,031)	12,298
Pre-Tax Income (Loss) [Abstract]
Pre-tax income (loss)	$ (80,939)	$ 7,870