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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss), net [Member]
Treasury Stock [Member]
Beginning balance at Dec. 31, 2014 $ 716,145 $ 105,563 $ 365,615 $ 353,027 $ (4,499) $ (103,561)
Beginning balance, Shares Outstanding at Dec. 31, 2014   91,723,028        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 50,143     50,143    
Total other comprehensive (loss) Income 2,113       2,113  
Cash dividends declared (25,089)     (25,089)    
Treasury stock acquired (25,383)         (25,383)
Treasury stock acquired, Shares Outstanding   (2,918,066)        
Treasury stock reissued 192   32 0   160
Treasury stock reissued, Shares Outstanding   20,936        
Restricted stock, Shares Outstanding   135,370        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 1,425 $ 0 334 0   1,091
Ending balance at Dec. 31, 2015 719,546 $ 105,563 365,981 378,081 (2,386) (127,693)
Ending balance, Shares Outstanding at Dec. 31, 2015   88,961,268        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 59,590     59,590    
Total other comprehensive (loss) Income (4,641)       (4,641)  
Cash dividends declared (24,907)     (24,907)    
Treasury stock acquired (864)         (864)
Treasury stock acquired, Shares Outstanding   (98,687)        
Treasury stock reissued 216   39 0   177
Treasury stock reissued, Shares Outstanding   23,148        
Restricted stock, Shares Outstanding   121,348        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 989 $ 0 406 0   583
Ending balance at Dec. 31, 2016 $ 749,929 $ 105,563 366,426 412,764 (7,027) (127,797)
Ending balance, Shares Outstanding at Dec. 31, 2016 89,007,077 89,007,077        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income $ 55,165     55,165    
Total other comprehensive (loss) Income 854       854  
Cash dividends declared (30,513)     (30,513)    
Treasury stock acquired (1,458)         (1,458)
Treasury stock acquired, Shares Outstanding   (104,257)        
Treasury stock reissued 2,557   1,170 0   1,387
Treasury stock reissued, Shares Outstanding   181,211        
Restricted stock, Shares Outstanding   21,000        
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 852 $ 0 138 0   714
Stock Issued During Period, Shares, New Issues   8,351,447        
Stock Issued During Period, Value, New Issues 110,741 $ 8,352 102,389      
Ending balance at Dec. 31, 2017 $ 888,127 $ 113,915 $ 470,123 $ 437,416 $ (6,173) $ (127,154)
Ending balance, Shares Outstanding at Dec. 31, 2017 97,456,478 97,456,478