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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance (shares) at Dec. 31, 2012   25,157,637        
Beginning Balance at Dec. 31, 2012 $ 498,208 $ 133,579 $ (25,626) $ 218,128 $ 180,628 $ (8,501)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 33,487       33,487  
Changes in other comprehensive income (loss) (3,472)         (3,472)
Comprehensive income 30,015          
Cash dividends ($0.68 per share) (19,303)       (19,303)  
Common stock issued in connection with an acquisition (shares)   6,175,576        
Common stock issued in connection with an acquisition 155,524 $ 29,702 4,074 121,748    
Repurchase of shares in connection with an acquisition related to stock-based compensation awards (shares)   (59,342)        
Repurchase of shares in connection with an acquisition related to stock-based compensation awards (1,496)   (1,496)      
Issuance of common stock for stock-based compensation awards (shares)   113,797        
Issuance of common stock for stock-based compensation awards (105)   25 (130)    
Stock-based compensation expense 2,806     2,806    
Other, net 3       3  
Ending Balance (shares) at Dec. 31, 2013   31,387,668        
Ending Balance at Dec. 31, 2013 665,652 $ 163,281 (23,023) 342,552 194,815 (11,973)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 59,582       59,582  
Changes in other comprehensive income (loss) 4,375         4,375
Comprehensive income 63,957          
Cash dividends ($0.68 per share) (21,518)       (21,518)  
Issuance of common stock for stock-based compensation awards (shares)   157,477        
Issuance of common stock for stock-based compensation awards (353)   895 (1,248)    
Stock-based compensation expense 3,909     3,909    
Other, net 4       4  
Ending Balance (shares) at Dec. 31, 2014   31,545,145        
Ending Balance at Dec. 31, 2014 711,651 $ 163,281 $ (22,128) 345,213 232,883 (7,598)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 68,014       68,014  
Changes in other comprehensive income (loss) (1,937)         (1,937)
Comprehensive income 66,077          
Cash dividends ($0.68 per share) (24,557)       (24,557)  
Common stock issued in connection with an acquisition (shares)   8,635,879        
Common stock issued in connection with an acquisition 281,530 $ 43,179 238,351    
Repurchase of shares in connection with an acquisition related to stock-based compensation awards (shares)   (18,635)        
Repurchase of shares in connection with an acquisition related to stock-based compensation awards (608)   $ (608)      
Issuance of common stock for stock-based compensation awards (shares)   130,902        
Issuance of common stock for stock-based compensation awards (1,722)   351 (2,073)    
Stock-based compensation expense 4,435     4,435    
Other, net 12     12    
Ending Balance (shares) at Dec. 31, 2015   40,293,291        
Ending Balance at Dec. 31, 2015 $ 1,036,818 $ 206,460 $ (22,385) $ 585,938 $ 276,340 $ (9,535)