CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 143,637	$ 89,798
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,833	17,079
Deferred tax expense	39,388	48,932
Net realized investment losses	329	125
Change in certain assets and liabilities:
Accrued investment income	937	287
Reinsurance recoverable on loss reserves	3,000	3,835
Reinsurance recoverable on paid losses	154	(165)
Premium receivable	1,344	485
Deferred insurance policy acquisition costs	(87)	(477)
Profit commission receivable	377	(3,395)
Loss reserves	(61,464)	(103,771)
Unearned premiums	4,754	7,585
Return premium accrual	(5,500)	(4,800)
Income taxes payable - current	(3,117)	34,654
Other, net	(5,619)	(12,703)
Net cash provided by operating activities	133,966	77,469
Purchases of investments:
Fixed income securities	(209,477)	(187,077)
Equity securities	(20)	(19)
Proceeds from sales of fixed income securities	10,844	33,980
Proceeds from maturity of fixed income securities	155,605	199,234
Net increase in payable for securities	0	10,336
Additions to property and equipment	(5,208)	(4,014)
Net cash (used in) provided by investing activities	(48,256)	52,440
Cash flows from financing activities:
Proceeds from revolving credit facility	0	150,000
Payment of debt issuance costs	0	(1,523)
Payment of withholding taxes related to share-based compensation net share settlement	(8,073)	(6,722)
Net cash (used in) provided by financing activities	(8,073)	141,755
Net increase in cash and cash equivalents	77,637	271,664
Cash and cash equivalents at beginning of period	99,851	155,410
Cash and cash equivalents at end of period	$ 177,488	$ 427,074