Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income	$ 33,125	$ 29,005
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	488	529
Net amortization of investments	5,979	7,394
Deferred income taxes	831	302
Net realized losses on investments	1,142	569
Net unrealized losses on equity securities	314
Net realized losses on disposal of assets		2
Share-based compensation	782	937
Changes in operating assets and liabilities:
Premiums receivable, net	(15,658)	(7,641)
Accrued interest receivable	177	153
Deferred policy acquisition costs	(1,350)	(1,582)
Amounts held by others	(7,855)
Other assets	942	(1,900)
Reserves for loss and loss adjustment expenses	11,756	6,983
Unearned premiums	10,040	3,867
Reinsurance balances	(8,828)	(509)
Amounts held for others and policyholder deposits	1,787	1,882
Accounts payable and other liabilities	3,312	807
Net cash provided by operating activities	36,984	40,798
Investing activities
Purchases of investments held-to-maturity	(38,129)	(96,697)
Purchases of investments available-for-sale	(56,550)	(50,193)
Purchases of short-term investments	(100,059)	(30,800)
Proceeds from maturities of investments held-to-maturity	52,584	66,276
Proceeds from sales and maturities of investments available-for-sale	66,762	54,062
Proceeds from sales and maturities of short-term investments	13,465	13,610
Proceeds from redemptions of other investments	130	6,000
Purchases of property and equipment	(1,004)	(240)
Net cash used in investing activities	(62,801)	(37,982)
Financing activities
Proceeds from stock option exercises	67
Dividends to shareholders	(8,633)	(7,785)
Net cash used in financing activities	(8,566)	(7,785)
Change in cash and cash equivalents	(34,383)	(4,969)
Cash and cash equivalents at beginning of period	55,559	58,936
Cash and cash equivalents at end of period	$ 21,176	$ 53,967