CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Premiums written:
Direct	$ 283,189	$ 274,726	$ 557,086	$ 544,760
Assumed	1,505	2,085	2,612	2,177
Ceded	(41,096)	(21,375)	(71,819)	(54,595)
Net premiums written	243,598	255,436	487,879	492,342
Decrease (increase) in unearned premiums, net	3,504	(8,472)	8,984	(13,271)
Net premiums earned	247,102	246,964	496,863	479,071
Investment income, net of expenses	42,423	34,502	83,008	66,623
Net realized investment gains (losses)	307	(1,897)	(219)	(2,226)
Other revenue	2,485	2,431	4,315	4,302
Total revenues	292,317	282,000	583,967	547,770
Losses and expenses:
Losses incurred, net	21,836	(13,455)	60,899	10,395
Amortization of deferred policy acquisition costs	2,760	2,845	5,238	5,417
Other underwriting and operating expenses, net	42,960	41,842	88,900	87,932
Interest expense	13,550	13,246	26,783	26,479
Total losses and expenses	81,106	44,478	181,820	130,223
Income before tax	211,211	237,522	402,147	417,547
Provision for income taxes	43,433	50,708	82,428	87,096
Net income	$ 167,778	$ 186,814	$ 319,719	$ 330,451
Earnings per share:
Basic (in dollars per share)	$ 0.47	$ 0.51	$ 0.90	$ 0.89
Diluted (in dollars per share)	$ 0.46	$ 0.49	$ 0.87	$ 0.87
Weighted average common shares outstanding - basic (in shares)	355,734	368,578	355,694	369,736
Weighted average common shares outstanding - diluted (in shares)	376,603	388,881	376,635	390,236