CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 89,798	$ 69,191
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,079	14,109
Deferred tax expense	48,932	33,270
Net realized investment losses (gains)	122	(3,056)
Loss on debt extinguishment	0	13,440
Change in certain assets and liabilities:
Accrued investment income	287	1,205
Prepaid insurance premium	15	34
Reinsurance recoverable on loss reserves	3,835	3,368
Reinsurance recoverable on paid losses	(165)	(536)
Premium receivable	485	1,284
Deferred insurance policy acquisition costs	(477)	(705)
Profit commission receivable	(3,395)	760
Loss reserves	(103,771)	(140,013)
Unearned premiums	7,585	9,906
Return premium accrual	(4,800)	(4,850)
Income taxes payable - current	34,654	289
Other, net	(12,715)	5,840
Net cash provided by operating activities	77,469	3,536
Purchases of investments:
Fixed income	(187,077)	(288,273)
Equity securities	(19)	(3,109)
Proceeds from sales of fixed income	33,980	315,927
Proceeds from maturity of fixed income	199,234	139,863
Proceeds from sale of equity securities	0	2,525
Net increase in payable for securities	10,336	44,289
Additions to property and equipment	(4,014)	(1,916)
Net cash provided by investing activities	52,440	209,306
Cash flows from financing activities:
Proceeds from revolving credit facility	150,000	0
Proceeds from issuance of long-term debt	0	155,000
Purchase of convertible senior notes	0	(134,105)
Payment of original issue discount - convertible senior notes	0	(4,148)
Purchase of convertible junior subordinated debentures	0	(100,860)
Payment of original issue discount - convertible junior subordinated debentures	0	(41,540)
Cash portion of loss on debt extinguishment	0	(13,440)
Payment of debt issuance costs	(1,523)	0
Payment of withholding taxes related to stock-based compensation net share settlement	(6,722)	(4,971)
Net cash provided by (used in) financing activities	141,755	(144,064)
Net increase in cash and cash equivalents	271,664	68,778
Cash and cash equivalents at beginning of period	155,410	181,120
Cash and cash equivalents at end of period	$ 427,074	$ 249,898