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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]
Previously Reported [Member]
Previously Reported [Member]
Common Stock [Member]
Previously Reported [Member]
Additional Paid-in-Capital [Member]
Previously Reported [Member]
Retained Earnings [Member]
Previously Reported [Member]
Accumulated Other Comprehensive Income (Loss), net [Member]
Previously Reported [Member]
Treasury Stock [Member]
Restatement Adjustment [Member]
Restatement Adjustment [Member]
Retained Earnings [Member]
Restatement Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), net [Member]
Beginning balance at Dec. 31, 2015 $ 719,546 $ 105,563 $ 365,981 $ 378,081 $ (2,386) $ (127,693)                  
Beginning 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   (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                          
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   (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 $ 113,915 470,123 438,760 (7,517) (127,154) $ 888,127 $ 113,915 $ 470,123 $ 437,416 $ (6,173) $ (127,154)      
Ending balance, Shares Outstanding at Dec. 31, 2017 97,456,478 97,456,478.000           97,456,478              
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Cumulative Effect of New Accounting Principle in Period of Adoption                           $ 1,344 $ (1,344)
Net Income $ 107,498     107,498                      
Total other comprehensive (loss) Income (3,824)       (3,824)                    
Cash dividends declared (34,849)     (34,849)                      
Treasury stock acquired (26,189)         (26,189)                  
Treasury stock acquired   (1,920,544)                          
Treasury stock reissued 44,026   21,579 0   22,447                  
Treasury stock reissued, Shares Outstanding   2,908,234                          
Restricted stock, Shares Outstanding   74,500                          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 600 $ 0 571 0   29                  
Ending balance at Dec. 31, 2018 $ 975,389 $ 113,915 $ 492,273 $ 511,409 $ (11,341) $ (130,867)                  
Ending balance, Shares Outstanding at Dec. 31, 2018 98,518,668 98,518,668                          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Cumulative Effect of New Accounting Principle in Period of Adoption                         $ 0