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Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings
Accumulated Other Comprehensive Income
Noncontrolling Interest [Member]
Balance, beginning of year at Dec. 31, 2015 $ 142,777 $ 0 $ 131,187 $ 11,483 $ 107
Balance, beginning of year, shares at Dec. 31, 2015   1,950      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 19,523   19,523    
Dividends (1,370)   (1,370)    
Shares of common stock repurchased and retired (in shares)   (67)      
Shares of common stock repurchased and retired (6,220)   (6,220)    
Stock options and stock appreciation rights exercised (in shares)   1      
Stock options and stock appreciation rights exercised 0   0    
Share-based compensation expense 132   132    
Amortization related to postretirement health benefits 5     5  
Net unrealized gain (loss) on investments 273     273  
Accumulated postretirement benefit obligation adjustment 0        
Purchase of noncontrolling interest of subsidiary (8)       (8)
Net income (loss) attributable to noncontrolling interest (8)       (8)
Income tax benefit from share-based compensation 32   32    
Balance, end of year at Dec. 31, 2016 155,136 $ 0 143,284 11,761 91
Balance, end of year, shares at Dec. 31, 2016   1,884      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 25,707   25,707    
Dividends (7,073)   (7,073)    
Shares of common stock repurchased and retired (in shares)   (1)      
Shares of common stock repurchased and retired (246)   (246)    
Stock options and stock appreciation rights exercised (in shares)   3      
Stock options and stock appreciation rights exercised 0   0    
Share-based compensation expense 219   219    
Amortization related to postretirement health benefits 6     6  
Net unrealized gain (loss) on investments 4,132     4,132  
Accumulated postretirement benefit obligation adjustment 46     46  
Net income (loss) attributable to noncontrolling interest (6)       (6)
Balance, end of year at Dec. 31, 2017 177,921 $ 0 161,891 15,945 85
Balance, end of year, shares at Dec. 31, 2017   1,886      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 21,892   21,892    
Dividends (23,017)   (23,017)    
Shares of common stock repurchased and retired (in shares)   0      
Shares of common stock repurchased and retired (29)   (29)    
Stock options and stock appreciation rights exercised (in shares)   1      
Stock options and stock appreciation rights exercised (1)   (1)    
Share-based compensation expense 327   327    
Cumulative-effect adjustment for adoption of new accounting standards 0   13,627 (13,627)  
Net unrealized gain (loss) on investments (1,406)     (1,406)  
Accumulated postretirement benefit obligation adjustment 37     37  
Subsidiary return of capital (52)       (52)
Net income (loss) attributable to noncontrolling interest (33)       (33)
Balance, end of year at Dec. 31, 2018 $ 175,639 $ 0 $ 174,690 $ 949 $ 0
Balance, end of year, shares at Dec. 31, 2018   1,887