Consolidated Statements of Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Gross Written Premiums	$ 580,976	$ 495,224
Revenues:
Net Written Premiums	461,667	393,262
Change in Unearned Premiums	(84,478)	(70,635)
Net Earned Premiums	377,189	322,627
Net Investment Income	28,219	23,702
Net Realized and Unrealized Gains (Losses):
Total Other-Than-Temporary Impairment Losses	(20)	(37)
Portion of Loss Recognized in Other Comprehensive Income	20	37
Net Other-Than-Temporary Impairment Losses Recognized in Earnings	0	0
Net Realized Gains on Investments Sold	393	1,169
Net Unrealized Gains (Losses) on Equity Securities	26,769	(3,181)
Total Net Realized and Unrealized Gains (Losses)	27,162	(2,012)
Other Loss	(4,272)	(117)
Total Revenues	428,298	344,200
Expenses:
Net Losses and Loss Adjustment Expenses	270,352	186,145
Commission Expenses	67,716	54,152
Other Operating Expenses	83,756	62,926
Merger Transaction Costs	850
Interest Expense	3,867	3,864
Total Expenses	426,541	307,087
Income Before Income Taxes	1,757	37,113
Income Tax Expense	3,495	6,235
Net Income (Loss)	$ (1,738)	$ 30,878
Net Income (Loss) per Common Share:
Basic	$ (0.06)	$ 1.04
Diluted	$ (0.06)	$ 1.02
Average common shares outstanding:
Basic	29,871	29,595
Diluted	29,871	30,137