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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Retained earnings
Accumulated other comprehensive income (loss)
Treasury stock
Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 2,247,705 $ 1,640,771 $ 711,249 $ 13,323 $ (117,638) $ (56,882) $ (56,882)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | Accounting Standards Update 2016-01 [Member]            
Beginning Balances (in shares) at Dec. 31, 2019   104,281,794     (5,790,796)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 66,021   66,021        
Other comprehensive income (loss) 23,108     23,108      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (44,856)   (44,856)        
Treasury Stock, Shares, Acquired         (880,000)    
Treasury Stock, Value, Acquired, Cost Method (16,686)       $ (16,686)    
Exercise of stock options, net of shares purchased (in shares)         10,405    
Exercise of stock options, net of shares purchased (72) $ (140)     $ (212)    
Restricted stock awards, net of forfeitures (in shares)         397,455    
Restricted stock awards, net of forfeitures (1,196) (9,294)     $ 8,098    
Share-based compensation expense 3,733 $ 3,733          
Ending Balances (in shares) at Jun. 30, 2020   104,281,794     (6,262,936)    
Ending Balances at Jun. 30, 2020 2,221,019   675,532 36,431 $ (126,014)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,179,383 $ 1,633,950 660,653 11,788 $ (127,008)    
Beginning Balances (in shares) at Mar. 31, 2020   104,281,794     (6,312,836)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 37,393   37,393        
Other comprehensive income (loss) 24,643     24,643      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (22,514)   (22,514)        
Restricted stock awards, net of forfeitures (in shares)         49,900    
Restricted stock awards, net of forfeitures (82) $ (1,076)     $ 994    
Share-based compensation expense 2,196 $ 2,196          
Ending Balances (in shares) at Jun. 30, 2020   104,281,794     (6,262,936)    
Ending Balances at Jun. 30, 2020 2,221,019   675,532 36,431 $ (126,014)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 1,635,070 675,532 36,431      
Retained Earnings (Accumulated Deficit) 720,429            
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,282,070 $ 1,638,947 720,429 48,664 $ (125,970)   $ (56,900)
Beginning Balances (in shares) at Dec. 31, 2020   104,281,794     (6,259,865)    
Beginning Balances at Dec. 31, 2020 2,282,070            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 98,203   98,203        
Other comprehensive income (loss) (17,929)     (17,929)      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (44,775)   (44,775)        
Treasury Stock, Shares, Acquired         (2,149,060)    
Treasury Stock, Value, Acquired, Cost Method (50,846)       $ (50,846)    
Exercise of stock options, net of shares purchased (in shares)         3,468    
Exercise of stock options, net of shares purchased (34) $ (36)     $ (70)    
Restricted stock awards, net of forfeitures (in shares)         323,172    
Restricted stock awards, net of forfeitures (2,585) (8,776)     $ 6,191    
Share-based compensation expense 5,335 $ 5,335          
Ending Balances (in shares) at Jun. 30, 2021   104,281,794     (8,082,285)    
Ending Balances at Jun. 30, 2021 2,269,507 $ 1,635,470 773,857 30,735 $ (170,555)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 2,258,942 $ 1,633,137 745,220 18,101 $ (137,516)    
Beginning Balances (in shares) at Mar. 31, 2021   104,281,794     (6,764,101)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 50,888   50,888        
Other comprehensive income (loss) 12,634     12,634      
Cash dividends declared :              
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020 (22,251)   (22,251)        
Treasury Stock, Shares, Acquired         (1,308,945)    
Treasury Stock, Value, Acquired, Cost Method (32,864)       $ (32,864)    
Restricted stock awards, net of forfeitures (in shares)         (9,239)    
Restricted stock awards, net of forfeitures (335) $ (160)     $ (175)    
Share-based compensation expense 2,493 $ 2,493          
Ending Balances (in shares) at Jun. 30, 2021   104,281,794     (8,082,285)    
Ending Balances at Jun. 30, 2021 2,269,507 $ 1,635,470 $ 773,857 $ 30,735 $ (170,555)    
Retained Earnings (Accumulated Deficit) $ 773,857