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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 117,051 $ 106,935 $ 99,410
Adjustments to reconcile net income to net cash provided by operating activities:      
Bad debt expense 467 501 406
Depreciation and amortization 4,820 4,058 3,242
Amortization of share-based compensation 12,786 10,515 10,288
Amortization of original issue discount on debt 0 10 149
Accretion of deferred credit 0 0 (149)
Book overdraft increase (decrease) 66,128 36,715 0
Net realized (gains) losses sale of securities 2,089 (2,570) (2,294)
Net change in unrealized gains (losses) of equity securities 17,169 0 0
Amortization of premium/accretion of discount, net 1,482 3,994 3,481
Deferred income taxes (3,740) 1,309 4,724
Excess tax (benefit) shortfall from share-based compensation (5,427) (5,793) 1,154
Other 196 35 31
Issuance of common stock 0 634 0
Net change in assets and liabilities relating to operating activities:      
Prepaid reinsurance premiums (9,944) (8,421) (9,712)
Reinsurance recoverable (236,198) (182,299) 22,747
Reinsurance receivable, net 0 186 167
Premiums receivable, net (3,823) (3,162) (3,249)
Accrued investment income (1,149) (708) (1,514)
Income taxes recoverable 3,741 (417) 1,004
Deferred policy acquisition costs, net (11,627) (8,147) (4,893)
Other assets (968) (1,860) 767
Unpaid losses and loss adjustment expenses 224,404 189,931 (40,346)
Unearned premiums 69,235 56,688 33,390
Accounts payable 193 (321) 2,809
Reinsurance payable, net (17,075) 29,490 7,306
Other liabilities and accrued expenses 289 9,287 (505)
Advance premium 6 8,420 (7,017)
Net cash provided by (used in) operating activities 230,105 245,010 121,396
Cash flows from investing activities:      
Proceeds from sale of property and equipment 35 23 36
Purchases of property and equipment (6,731) (4,618) (8,223)
Purchases of equity securities (25,803) (89,302) (66,688)
Purchases of available -for-sale debt securities (437,635) (180,604) (320,131)
Purchases of short-term investments 0 (10,000) 0
Purchases of investment real estate, net (6,375) (7,218) (5,496)
Proceeds from sales of equity securities 8,285 77,640 60,558
Proceeds from sales of available-for-sale debt securities 134,591 26,179 86,018
Maturities of available-for-sale debt securities 111,347 97,191 54,615
Maturities of short-term investments 10,000 5,000 25,000
Net cash provided by (used in) investing activities (212,286) (85,709) (174,311)
Cash flows from financing activities:      
Preferred stock dividend (10) (10) (10)
Common stock dividend (25,508) (24,001) (24,192)
Issuance of common stock for stock option exercises 102 0 119
Purchase of treasury stock (25,276) (18,141) (8,510)
Sale of treasury stock 0 0 2,965
Payments related to tax withholding for share-based compensation (12,714) (7,223) (5,451)
Excess tax benefit (shortfall) from share-based compensation 0 0 (1,154)
Repayment of debt (1,471) (2,170) (2,136)
Net cash provided by (used in) financing activities (64,877) (51,545) (38,369)
Cash and cash equivalents, and restricted cash and cash equivalents:      
Net increase (decrease) during the period (47,058) 107,756 (91,284)
Balance, beginning of period 216,121 108,365 199,649
Balance, end of period 169,063 216,121 108,365
Supplemental cash and non-cash flow disclosures:      
Interest paid 346 348 421
Income taxes paid 41,996 68,883 63,378
Income tax refund 747 434 5,633
Cash and cash equivalents, and restricted cash and cash equivalents within the Consolidated Balance Sheets      
Total cash and cash equivalents and restricted cash and cash equivalents $ 216,121 $ 216,121 $ 199,649