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Consolidated Statements of Changes in Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of change in accounting principle, net of tax effect $ 0     $ 2,203 $ (2,203)
Beginning balance at Dec. 31, 2017 463,209 $ 21 $ 84,866 376,119 2,203
Beginning balance (in shares) at Dec. 31, 2017   20,520,856      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,285        
Share-based compensation 457   487 (30)  
Issuance of restricted and deferred stock units (2,020)   (2,020)    
Issuance of restricted and deferred stock units (in shares)   51,442      
Employee stock purchase plan 653   653    
Employee stock purchase plan (in shares)   12,838      
Dividends paid (5,754)     (5,754)  
Ending balance at Mar. 31, 2018 457,830 $ 21 83,986 373,823 0
Ending balance (in shares) at Mar. 31, 2018   20,585,136      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect of change in accounting principle, net of tax effect 97     97  
Beginning balance at Dec. 31, 2018 $ 889,312 $ 28 495,366 393,918 0
Beginning balance (in shares) at Dec. 31, 2018 20,520,856 28,404,316      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 5,873        
Share-based compensation 870   886 (16)  
Issuance of restricted and deferred stock units (132)   (132)    
Issuance of restricted and deferred stock units (in shares)   14,312      
Employee stock purchase plan 811   811    
Employee stock purchase plan (in shares)   15,932      
Common stock issuance cost (10)   (10)    
Dividends paid (8,528)     (8,528)  
Ending balance at Mar. 31, 2019 $ 888,293 $ 28 $ 496,921 $ 391,344 $ 0
Ending balance (in shares) at Mar. 31, 2019 28,404,316 28,434,560