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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Common Stock in Treasury [Member]
Total
Cumulative Effect Adjustment for ASU Implementation [Member]
Common Stock [Member]
Cumulative Effect Adjustment for ASU Implementation [Member]
Additional Paid-in-Capital [Member]
Cumulative Effect Adjustment for ASU Implementation [Member]
Retained Earnings [Member]
Cumulative Effect Adjustment for ASU Implementation [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Cumulative Effect Adjustment for ASU Implementation [Member]
Common Stock in Treasury [Member]
Cumulative Effect Adjustment for ASU Implementation [Member]
Balance at Dec. 31, 2018 $ 497 $ 575,466 $ 621,203 $ (43,174) $ (136,083) $ 1,017,909            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 121,021 0 0 121,021            
Cash dividends 0 0 (46,010) 0 0 (46,010)            
Net issuance of shares to employee and other stock plans 0 (2,968) 0 0 2,087 (881)            
Stock-based compensation 0 4,210 0 0 0 4,210            
Other comprehensive income (loss) 0 0 0 24,148 0 24,148            
Balance at Dec. 31, 2019 497 576,708 696,214 (19,026) (133,996) 1,120,397            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 104,388 0 0 104,388            
Cash dividends 0 0 (47,207) 0 0 (47,207)            
Purchase of treasury shares 0 0 0 0 (7,980) (7,980)            
Net issuance of shares to employee and other stock plans 0 (3,207) 0 0 1,542 (1,665)            
Stock-based compensation 0 4,581 0 0 0 4,581            
Other comprehensive income (loss) 0 0 0 19,443 0 19,443            
Balance at Dec. 31, 2020 497 578,082 749,056 417 (140,434) 1,187,618            
Balance (ASU 2016-13 [Member]) at Dec. 31, 2020             $ 0 $ 0 $ (4,339) $ 0 $ 0 $ (4,339)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 154,885 0 0 154,885            
Cash dividends 0 0 (47,738) 0 0 (47,738)            
Purchase of treasury shares 0 0 0 0 (21,714) (21,714)            
Net issuance of shares to employee and other stock plans 0 (5,520) 0 0 2,269 (3,251)            
Stock-based compensation 0 4,414 0 0 0 4,414            
Other comprehensive income (loss) 0 0 0 (23,761) 0 (23,761)            
Balance at Dec. 31, 2021 $ 497 $ 576,976 $ 856,203 $ (23,344) $ (159,879) $ 1,250,453