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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, shares at Dec. 31, 2016   1,884      
Balance, beginning of year at Dec. 31, 2016 $ 155,136 $ 0 $ 143,284 $ 11,761 $ 91
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 16,078   16,078    
Dividends paid (1,792)   (1,792)    
Shares of common stock repurchased and retired (in shares)   0      
Shares of common stock repurchased and retired (50)   (50)    
Stock options and stock appreciation rights exercised (in shares)   3      
Stock options and stock appreciation rights exercised (1)   (1)    
Share-based compensation expense related to stock appreciation rights 157   157    
Amortization related to postretirement health benefits 4     4  
Net unrealized gain (loss) on investments 2,610     2,610  
Distribution of equity to noncontrolling interests 0        
Net loss attributable to noncontrolling interests (11)       (11)
Balance, end of year, shares at Sep. 30, 2017   1,887      
Balance, end of year at Sep. 30, 2017 172,131 $ 0 157,676 14,375 80
Balance, beginning of year, shares at Jun. 30, 2017   1,887      
Balance, beginning of year at Jun. 30, 2017 166,230 $ 0 152,482 13,668 80
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 5,927   5,927    
Dividends paid (754)   (754)    
Shares of common stock repurchased and retired (in shares)   0      
Shares of common stock repurchased and retired (41)   (41)    
Stock options and stock appreciation rights exercised (in shares)   0      
Stock options and stock appreciation rights exercised 0   0    
Share-based compensation expense related to stock appreciation rights 62   62    
Amortization related to postretirement health benefits 1     1  
Net unrealized gain (loss) on investments 706     706  
Net loss attributable to noncontrolling interests 0       0
Balance, end of year, shares at Sep. 30, 2017   1,887      
Balance, end of year at Sep. 30, 2017 172,131 $ 0 157,676 14,375 80
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, shares at Dec. 31, 2017   1,886      
Balance, beginning of year at Dec. 31, 2017 177,921 $ 0 161,891 15,945 85
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 21,757   21,757    
Dividends paid (2,264)   (2,264)    
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 related to stock appreciation rights 239   239    
Net unrealized gain (loss) on investments (1,999)     (1,999)  
Distribution of equity to noncontrolling interests (52)       (52)
Net loss attributable to noncontrolling interests (31)       (31)
Balance, end of year, shares at Sep. 30, 2018   1,887      
Balance, end of year at Sep. 30, 2018 195,541 $ 0 195,220 319 2
Balance, beginning of year, shares at Jun. 30, 2018   1,887      
Balance, beginning of year at Jun. 30, 2018 186,113 $ 0 185,252 806 55
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income attributable to the Company 10,634   10,634    
Dividends paid (755)   (755)    
Shares of common stock repurchased and retired (in shares)   0      
Shares of common stock repurchased and retired 0   0    
Stock options and stock appreciation rights exercised (in shares)   0      
Stock options and stock appreciation rights exercised 0   0    
Share-based compensation expense related to stock appreciation rights 89   89    
Net unrealized gain (loss) on investments (487)     (487)  
Distribution of equity to noncontrolling interests (52)       (52)
Net loss attributable to noncontrolling interests (1)       (1)
Balance, end of year, shares at Sep. 30, 2018   1,887      
Balance, end of year at Sep. 30, 2018 195,541 $ 0 195,220 319 $ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect adjustment for adoption of new accounting standards $ 0   $ 0 $ 0