CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Premiums written:
Direct	$ 275,245,000	$ 282,113,000	$ 541,068,000	$ 547,404,000
Assumed	685,000	182,000	1,973,000	390,000
Ceded	(30,096,000)	(32,280,000)	(60,505,000)	(66,498,000)
Net premiums written	245,834,000	250,015,000	482,536,000	481,296,000
Increase in unearned premiums, net	(14,698,000)	(18,559,000)	(22,297,000)	(28,499,000)
Net premiums earned	231,136,000	231,456,000	460,239,000	452,797,000
Investment income, net of expenses	29,716,000	27,248,000	59,193,000	55,057,000
Net realized investment (losses) gains	(42,000)	836,000	(164,000)	3,892,000
Other revenue	2,502,000	3,994,000	4,924,000	10,367,000
Total revenues	263,312,000	263,534,000	524,192,000	522,113,000
Losses and expenses:
Losses incurred, net	27,339,000	46,590,000	54,958,000	131,602,000
Amortization of deferred policy acquisition costs	2,584,000	2,245,000	4,814,000	4,206,000
Other underwriting and operating expenses, net	38,511,000	35,348,000	79,276,000	75,125,000
Interest expense	14,197,000	12,244,000	30,506,000	26,945,000
Loss on debt extinguishment	65,000	1,868,000	65,000	15,308,000
Total losses and expenses	82,696,000	98,295,000	169,619,000	253,186,000
Income before tax	180,616,000	165,239,000	354,573,000	268,927,000
Provision for income taxes	61,994,000	56,018,000	146,153,000	90,515,000
Net income	$ 118,622,000	$ 109,221,000	$ 208,420,000	$ 178,412,000
Earnings per share:
Basic (in dollars per share)	$ 0.32	$ 0.32	$ 0.59	$ 0.52
Diluted (in dollars per share)	$ 0.31	$ 0.26	$ 0.55	$ 0.43
Weighted average common shares outstanding - basic (in shares)	366,918	340,678	354,035	340,411
Weighted average common shares outstanding - diluted (in shares)	394,470	446,139	398,302	450,354