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Consolidated Statements of Changes in Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018 $ 889,312 $ 28 $ 495,366 $ 393,918 $ 0
Beginning balance (in shares) at Dec. 31, 2018   28,404,316      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 5,873     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    
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs (10)   (10)    
Employee stock purchase plan (in shares)   15,932      
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   28,434,560      
Beginning balance at Dec. 31, 2019 $ 889,984 $ 28 506,639 383,191 126
Beginning balance (in shares) at Dec. 31, 2019 28,456,508 28,456,508      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 2,417     2,417  
Unrealized Gain (Loss) on Investments (135)       (135)
Share-based compensation 208   251 (43)  
Issuance of restricted and deferred stock units (785)   (785)    
Issuance of restricted and deferred stock units (in shares)   25,781      
Employee stock purchase plan 970   970    
Employee stock purchase plan (in shares)   15,552      
Dividends paid (9,118)     (9,118)  
Ending balance at Mar. 31, 2020 $ 883,541 $ 28 $ 507,075 $ 376,447 $ (9)
Ending balance (in shares) at Mar. 31, 2020 28,497,841 28,497,841