Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net income	$ 37,290	$ 33,125
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	449	488
Net amortization of investments	4,483	5,979
Deferred income taxes	(526)	831
Net realized losses on investments	23	1,142
Net unrealized (gains) losses on equity securities	(2,800)	314
Share-based compensation	509	782
Changes in operating assets and liabilities:
Premiums receivable, net	(12,542)	(15,658)
Accrued interest receivable	111	177
Deferred policy acquisition costs	(816)	(1,350)
Amounts held by others	1	(7,855)
Other assets	(947)	942
Reserves for loss and loss adjustment expenses	(3,363)	11,756
Unearned premiums	7,593	10,040
Reinsurance balances	8,317	(8,828)
Amounts held for others and policyholder deposits	1,976	1,787
Accounts payable and other liabilities	(189)	3,312
Net cash provided by operating activities	39,569	36,984
Investing activities
Purchases of investments held-to-maturity	(67,571)	(38,129)
Purchases of investments available-for-sale	(27,356)	(52,211)
Purchases of equity securities	(2,620)	(4,339)
Purchases of short-term investments	(79,224)	(100,059)
Proceeds from maturities of investments held-to-maturity	73,865	52,584
Proceeds from sales and maturities of investments available-for-sale	60,494	66,480
Proceeds from sales of equity securities		282
Proceeds from sales and maturities of short-term investments	23,679	13,465
Proceeds from redemptions of other investments		130
Purchases of property and equipment	(148)	(1,004)
Net cash used in investing activities	(18,881)	(62,801)
Financing activities
Proceeds from stock option exercises	20	67
Finance lease purchases	(23)
Dividends to shareholders	(9,783)	(8,633)
Net cash used in financing activities	(9,786)	(8,566)
Change in cash and cash equivalents	10,902	(34,383)
Cash and cash equivalents at beginning of period	40,344	55,559
Cash and cash equivalents at end of period	$ 51,246	$ 21,176