CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 319,719	$ 330,451
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,464	31,395
Deferred tax expense	7,043	92,428
Net realized investment losses	219	2,226
Change in certain assets and liabilities:
Accrued investment income	(271)	(1,065)
Reinsurance recoverable on loss reserves	14,926	11,423
Reinsurance recoverable on paid losses	(13,955)	577
Premium receivable	(2,402)	(2,168)
Deferred insurance policy acquisition costs	219	34
Profit commission receivable	(976)	(11,202)
Loss reserves	(52,117)	(172,620)
Unearned premiums	(8,986)	13,225
Return premium accrual	(7,300)	(12,200)
Current income taxes	(2,300)	(21,936)
Other, net	4,328	2,025
Net cash provided by operating activities	281,611	262,593
Cash flows from investing activities:
Purchases of investments	(677,391)	(516,712)
Proceeds from sales of investments	183,620	25,185
Proceeds from maturity of fixed income securities	327,818	423,933
Net increase in payable for securities	0	13,432
Additions to property and equipment	(3,280)	(8,256)
Net cash used in investing activities	(169,233)	(62,418)
Cash flows from financing activities:
Repurchase of common stock	(36,581)	(100,059)
Payment of withholding taxes related to share-based compensation net share settlement	(5,652)	(8,073)
Net cash used in financing activities	(42,233)	(108,132)
Net increase in cash and cash equivalents and restricted cash and cash equivalents	70,145	92,043
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	155,038	99,851
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 225,183	$ 191,894