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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Common stock
Class A Common Stock
Common stock
Class B Common Stock
Retained earnings
Accumulated other comprehensive income (loss)
Beginning balance at Dec. 31, 2016 $ 222,847 $ 199,981     $ 23,518 $ (652)
Beginning balance (in shares) at Dec. 31, 2016     29,530,072 4,723,530    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 100,499       100,499  
Other comprehensive income (loss) (381)         (381)
Issuance of restricted stock 0          
Issuance of restricted stock (in shares)     307,613      
Withholding cash issued in lieu of restricted stock issuance (4,891) (4,891)        
Employee stock purchase program 445 445        
Employee stock purchase program (in shares)     22,634      
Stock option exercises 1,026 1,026        
Stock option exercises (in shares)     109,010      
Stock option based compensation expense 1,786 1,786        
Restricted stock expense 5,717 5,717        
Stock issued in acquisition of Reltco, Inc. 565 565        
Stock issued in acquisition of Reltco, Inc. (in shares)     27,724      
Non-voting common stock converted to voting common stock in private sale (in shares)     80,000 (80,000)    
Issuance of common stock in connection with secondary offering, net of issue costs 113,096 113,096        
Issuance of common stock in connection with secondary offering, net of issue costs (in shares)     5,175,000      
Cash dividends (3,776)       (3,776)  
Ending balance at Dec. 31, 2017 436,933 317,725     120,241 (1,033)
Ending balance (in shares) at Dec. 31, 2017     35,252,053 4,643,530    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51,448       51,448  
Other comprehensive income (loss) (400)         (400)
Issuance of restricted stock 0          
Issuance of restricted stock (in shares)     64,308      
Withholding cash issued in lieu of restricted stock issuance (756) (756)        
Employee stock purchase program 342 342        
Employee stock purchase program (in shares)     14,339      
Stock option exercises 1,626 1,626        
Stock option exercises (in shares)     181,562      
Stock option based compensation expense 1,713 1,713        
Restricted stock expense 7,463 7,463        
Reclassification of accumulated other comprehensive income due to tax rate change         244 (244)
Cash dividends (4,809)       (4,809)  
Ending balance at Dec. 31, 2018 493,560 328,113     167,124 (1,677)
Ending balance (in shares) at Dec. 31, 2018     35,512,262 4,643,530    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 18,034       18,034  
Other comprehensive income (loss) 13,401         13,401
Issuance of restricted stock 0          
Issuance of restricted stock (in shares)     61,121      
Withholding cash issued in lieu of restricted stock issuance (409) (409)        
Employee stock purchase program 437 437        
Employee stock purchase program (in shares)     29,493      
Stock option exercises $ 508 508        
Stock option exercises (in shares) 75,088   70,568      
Stock option based compensation expense $ 1,723 1,723        
Restricted stock expense 10,025 10,025        
Non-voting common stock converted to voting common stock in private sale (in shares)     1,727,999 (1,727,999)    
Cash dividends (4,827)       (4,827)  
Ending balance at Dec. 31, 2019 532,386 $ 340,397     180,265 $ 11,724
Ending balance (in shares) at Dec. 31, 2019     37,401,443 2,915,531    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of accounting change for Accounting Standards Update 2016-02 | Accounting Standards Update 2016-02 [Member] $ (66)       $ (66)