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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ASSETS        
Cash and cash equivalents $ 166,428 $ 213,486 $ 105,730  
Fair Value 820,438 639,334    
Equity securities 63,277 62,215    
Income taxes recoverable 11,159 9,472    
Deferred income taxes 14,586 9,286    
Other assets 14,540 12,461    
Total assets 1,858,390 1,454,999    
LIABILITIES:        
Accounts payable 3,059 2,866    
Other accrued expenses 45,422 45,096    
Total liabilities 1,356,757 1,015,011    
STOCKHOLDERS’ EQUITY:        
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share 0 0    
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,514 and 45,778 Outstanding shares – 34,783 and 34,735 465 458    
Treasury shares, at cost - 11,731 and 11,043 (130,399) (105,123)    
Additional paid-in capital 86,353 86,186    
Accumulated other comprehensive income (loss), net of taxes (8,010) (6,281)    
Retained earnings 553,224 464,748    
Total stockholders’ equity 501,633 439,988 $ 371,190 $ 293,092
Total liabilities and stockholders’ equity 1,858,390 1,454,999    
Parent Company        
ASSETS        
Cash and cash equivalents 91,374 67,509    
Investments in subsidiaries and undistributed earnings 401,296 359,847    
Fair Value 2,986 3,111    
Equity securities 2,626 5,238    
Income taxes recoverable 11,136 9,472    
Deferred income taxes 6,512 9,286    
Other assets 261 431    
Total assets 516,191 454,894    
LIABILITIES:        
Accounts payable 29 4    
Dividends payable 77 40    
Other accrued expenses 14,001 14,862    
Total liabilities 14,107 14,906    
STOCKHOLDERS’ EQUITY:        
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share 0 0    
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,514 and 45,778 Outstanding shares – 34,783 and 34,735 465 458    
Treasury shares, at cost - 11,731 and 11,043 (130,399) (105,123)    
Additional paid-in capital 86,353 86,186    
Accumulated other comprehensive income (loss), net of taxes (8,010) (6,281)    
Retained earnings 553,675 464,748    
Total stockholders’ equity 502,084 439,988    
Total liabilities and stockholders’ equity $ 516,191 $ 454,894