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Consolidated Statements of 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, 2019 $ 497 $ 576,708 $ 696,214 $ (19,026) $ (133,996) $ 1,120,397            
Balance (ASU 2016-13 [Member]) at Dec. 31, 2019             $ 0 $ 0 $ (4,339) $ 0 $ 0 $ (4,339)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 10,368 0 0 10,368            
Cash dividends 0 0 (23,632) 0 0 (23,632)            
Purchase of treasury shares 0 0 0 0 (7,980) (7,980)            
Net issuance of shares to employee and other stock plans 0 (2,303) 0 0 759 (1,544)            
Stock-based compensation 0 2,675 0 0 0 2,675            
Other comprehensive income (loss) 0 0 0 16,234 0 16,234            
Balance at Mar. 31, 2020 497 577,080 678,611 (2,792) (141,217) 1,112,179            
Balance at Dec. 31, 2020 497 578,082 749,056 417 (140,434) 1,187,618            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 39,846 0 0 39,846            
Cash dividends 0 0 (11,732) 0 0 (11,732)            
Purchase of treasury shares 0 0 0 0 (9,020) (9,020)            
Net issuance of shares to employee and other stock plans 0 (2,153) 0 0 870 (1,283)            
Stock-based compensation 0 2,668 0 0 0 2,668            
Other comprehensive income (loss) 0 0 0 (17,116) 0 (17,116)            
Balance at Mar. 31, 2021 $ 497 $ 578,597 $ 777,170 $ (16,699) $ (148,584) $ 1,190,981