Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Net premiums earned	$ 870,245	$ 808,084
Net investment income	34,174	31,510
Net realized investment gains (losses)	111,074	(58,735)
Other	2,250	2,325
Total revenues	1,017,743	783,184
Expenses:
Losses and loss adjustment expenses	630,416	632,234
Policy acquisition costs	148,413	140,984
Other operating expenses	67,489	65,399
Interest	4,256	4,266
Total expenses	850,574	842,883
Income (loss) before income taxes	167,169	(59,699)
Income tax expense (benefit)	31,302	(17,092)
Net income (loss)	$ 135,867	$ (42,607)
Net income (loss) per share:
Basic (in dollars per share)	$ 2.46	$ (0.77)
Diluted (in dollars per share)	$ 2.45	$ (0.77)
Weighted average shares outstanding:
Basic (in shares)	55,341	55,332
Diluted (in shares)	55,348	55,332