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Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income
Noncontrolling Interest [Member]
Balance, beginning of year at Dec. 31, 2016 $ 155,136 $ 0 $ 143,284 $ 11,761 $ 91
Balance, beginning of year, shares at Dec. 31, 2016   1,884      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 4,476   4,476    
Dividends (377)   (377)    
Shares of common stock repurchased and retired (in shares)   0      
Shares of common stock repurchased and retired (9)   (9)    
Stock options and stock appreciation rights exercised (in shares)   2      
Stock options and stock appreciation rights exercised (1)   (1)    
Share-based compensation expense 32   32    
Amortization related to postretirement health benefits 2     2  
Net unrealized gain (loss) on investments 1,038     1,038  
Net loss attributable to noncontrolling interests (10)       (10)
Balance, end of year at Mar. 31, 2017 160,287 $ 0 147,405 12,801 81
Balance, end of year, shares at Mar. 31, 2017   1,886      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect adjustment for adoption of new accounting standards 0   13,627 (13,627)  
Balance, beginning of year at Dec. 31, 2017 177,921 $ 0 161,891 15,945 85
Balance, beginning of year, shares at Dec. 31, 2017   1,886      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 4,176   4,176    
Dividends (755)   (755)    
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 62   62    
Net unrealized gain (loss) on investments (1,309)     (1,309)  
Net loss attributable to noncontrolling interests (3)       (3)
Balance, end of year at Mar. 31, 2018 $ 180,062 $ 0 $ 178,971 $ 1,009 $ 82
Balance, end of year, shares at Mar. 31, 2018   1,887