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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net income $ 106,935 $ 99,410 $ 106,484
Adjustments to reconcile net income to net cash provided by operating activities:      
Bad debt expense 501 406 611
Depreciation and amortization 4,058 3,242 2,033
Amortization of share-based compensation 10,515 10,288 17,386
Amortization of original issue discount on debt 10 149 521
Accretion of deferred credit   (149) (521)
Book overdraft increase (decrease) 36,715   (5,924)
Net realized (gains) losses on investments (2,570) (2,294) (1,060)
Amortization of premium/accretion of discount, net 3,994 3,481 1,831
Deferred income taxes 1,309 4,724 (693)
Excess tax (benefits) shortfall from share-based compensation (5,793) 1,154 (5,310)
Other 35 31 42
Issuance of common stock 634    
Net change in assets and liabilities relating to operating activities:      
Prepaid reinsurance premiums (8,421) (9,712) 75,832
Reinsurance recoverable (182,299) 22,747 32,334
Reinsurance receivable, net 186 167 7,115
Premiums receivable, net (3,162) (3,249) (385)
Accrued investment income (708) (1,514) (298)
Income taxes recoverable (417) 1,004 255
Deferred policy acquisition costs, net (8,147) (4,893) (34,359)
Other assets (1,860) 767 (2,533)
Unpaid losses and loss adjustment expenses 189,931 (40,346) (35,513)
Unearned premiums 56,688 33,390 46,618
Accounts payable (321) 2,809 (3,743)
Reinsurance payable, net 29,490 7,306 7,519
Income taxes payable     3,510
Other liabilities and accrued expenses 9,287 (505) 625
Advance premium 8,420 (7,017) 6,894
Net cash provided by (used in) operating activities 245,010 121,396 219,271
Cash flows from investing activities:      
Proceeds from sale of property and equipment 23 36 86
Purchases of property and equipment (4,618) (8,223) (11,869)
Payments to acquire a business     (1,000)
Purchases of equity securities (89,302) (66,688) (65,038)
Purchases of fixed maturities (180,604) (320,131) (178,198)
Purchases of short-term investments (10,000)   (87,538)
Purchases of investment real estate, net (7,218) (5,496) (6,220)
Proceeds from sales of equity securities 77,640 60,558 41,456
Proceeds from sales of fixed maturities 26,179 86,018 38,379
Proceeds from sales of short-term investments     12,500
Maturities of fixed maturities 97,191 54,615 74,390
Maturities of short-term investments 5,000 25,000 100,000
Net cash provided by (used in) investing activities (85,709) (174,311) (83,052)
Cash flows from financing activities:      
Preferred stock dividend (10) (10) (10)
Common stock dividend (24,001) (24,192) (22,287)
Issuance of common stock for stock option exercises   119 511
Purchase of treasury stock (18,141) (8,510) (18,649)
Sale of treasury stock   2,965  
Purchase of preferred stock     (256)
Payments related to tax withholding for share-based compensation (7,223) (5,451) (12,141)
Excess tax benefits (shortfall) from share-based compensation   (1,154) 5,310
Repayment of debt (2,170) (2,136) (8,470)
Borrowings under promissory note     1,390
Net cash provided by (used in) financing activities (51,545) (38,369) (54,602)
Net increase (decrease) in cash and cash equivalents 107,756 (91,284) 81,617
Cash and cash equivalents at beginning of period 105,730 197,014 115,397
Cash and cash equivalents at end of period 213,486 105,730 197,014
Supplemental cash and non-cash flow disclosures:      
Interest paid 348 421 963
Income taxes paid 68,883 63,378 $ 65,383
Income tax refund $ 434 $ 5,633