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Consolidated Statements of Changes in Stockholders' Equity (unaudited) - 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, 2021 $ 497 $ 576,976 $ 856,203 $ (23,344) $ (159,879) $ 1,250,453            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 115,874 0 0 115,874            
Cash dividends 0 0 (36,907) 0 0 (36,907)            
Purchase of treasury shares 0 0 0 0 (14,713) (14,713)            
Net issuance of shares to employee and other stock plans 0 (3,026) 0 0 1,111 (1,915)            
Stock-based compensation 0 3,949 0 0 0 3,949            
Other comprehensive (loss) 0 0 0 (160,195) 0 (160,195)            
Balance at Sep. 30, 2022 497 577,899 935,170 (183,539) (173,481) 1,156,546            
Balance at Jun. 30, 2022 497 577,345 909,029 (124,781) (173,534) 1,188,556            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 38,973 0 0 38,973            
Cash dividends 0 0 (12,832) 0 0 (12,832)            
Net issuance of shares to employee and other stock plans 0 (116) 0 0 53 (63)            
Stock-based compensation 0 670 0 0 0 670            
Other comprehensive (loss) 0 0 0 (58,758) 0 (58,758)            
Balance at Sep. 30, 2022 497 577,899 935,170 (183,539) (173,481) 1,156,546            
Balance at Dec. 31, 2022 497 577,853 958,433 (190,034) (173,195) 1,173,554            
Balance (ASU 2022-02 [Member]) at Dec. 31, 2022             $ 0 $ 0 $ 502 $ 0 $ 0 $ 502
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 88,336 0 0 88,336            
Cash dividends 0 0 (40,812) 0 0 (40,812)            
Issuance of common stock for acquisition 43 161,680 0 0 0 161,723            
Purchase of treasury shares 0 0 0 0 (4,944) (4,944)            
Net issuance of shares to employee and other stock plans 0 (3,093) 0 0 963 (2,130)            
Stock-based compensation 0 4,137 0 0 0 4,137            
Other comprehensive (loss) 0 0 0 (17,545) 0 (17,545)            
Balance at Sep. 30, 2023 540 740,577 1,006,459 (207,579) (177,176) 1,362,821            
Balance at Jun. 30, 2023 497 578,322 996,920 (190,100) (175,146) 1,210,493            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 24,606 0 0 24,606            
Cash dividends 0 0 (15,067) 0 0 (15,067)            
Issuance of common stock for acquisition 43 161,680 0 0 0 161,723            
Purchase of treasury shares 0 0 0 0 (2,166) (2,166)            
Net issuance of shares to employee and other stock plans 0 (250) 0 0 136 (114)            
Stock-based compensation 0 825 0 0 0 825            
Other comprehensive (loss) 0 0 0 (17,479) 0 (17,479)            
Balance at Sep. 30, 2023 $ 540 $ 740,577 $ 1,006,459 $ (207,579) $ (177,176) $ 1,362,821