CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Premiums written:
Direct	$ 270,034	$ 265,823
Assumed	92	1,288
Ceded	(33,220)	(30,409)
Net premiums written	236,906	236,702
Increase in unearned premiums, net	(4,799)	(7,599)
Net premiums earned	232,107	229,103
Investment income, net of expenses	32,121	29,477
Net realized investment losses	(329)	(125)
Other revenue	1,871	2,425
Total revenues	265,770	260,880
Losses and expenses:
Losses incurred, net	23,850	27,619
Amortization of deferred policy acquisition costs	2,572	2,230
Other underwriting and operating expenses, net	46,090	40,765
Interest expense	13,233	16,309
Total losses and expenses	85,745	86,923
Income before tax	180,025	173,957
Provision for income taxes	36,388	84,159
Net income	$ 143,637	$ 89,798
Earnings per share:
Basic (in dollars per share)	$ 0.39	$ 0.26
Diluted (in dollars per share)	$ 0.38	$ 0.24
Weighted average common shares outstanding - basic (in shares)	370,908	341,009
Weighted average common shares outstanding - diluted (in shares)	391,562	402,175