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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, 2018 $ 497 $ 575,466 $ 621,203 $ (43,174) $ (136,083) $ 1,017,909            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 92,061 0 0 92,061            
Cash dividends 0 0 (34,174) 0 0 (34,174)            
Net issuance of shares to employee and other stock plans 0 (2,916) 0 0 1,875 (1,041)            
Stock-based compensation 0 3,596 0 0 0 3,596            
Other comprehensive income (loss) 0 0 0 20,250 0 20,250            
Balance at Sep. 30, 2019 497 576,146 679,090 (22,924) (134,208) 1,098,601            
Balance at Jun. 30, 2019 497 575,794 658,107 (25,036) (134,539) 1,074,823            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 32,379 0 0 32,379            
Cash dividends 0 0 (11,396) 0 0 (11,396)            
Net issuance of shares to employee and other stock plans 0 (104) 0 0 331 227            
Stock-based compensation 0 456 0 0 0 456            
Other comprehensive income (loss) 0 0 0 2,112 0 2,112            
Balance at Sep. 30, 2019 497 576,146 679,090 (22,924) (134,208) 1,098,601            
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 70,194 0 0 70,194            
Cash dividends 0 0 (35,419) 0 0 (35,419)            
Purchase of treasury shares 0 0 0 0 (7,980) (7,980)            
Net issuance of shares to employee and other stock plans 0 (2,928) 0 0 1,182 (1,746)            
Stock-based compensation 0 3,957 0 0 0 3,957            
Other comprehensive income (loss) 0 0 0 21,047 0 21,047            
Balance at Sep. 30, 2020 497 577,737 726,650 2,021 (140,794) 1,166,111            
Balance at Jun. 30, 2020 497 577,197 703,322 2,488 (140,852) 1,142,652            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 0 0 35,113 0 0 35,113            
Cash dividends 0 0 (11,785) 0 0 (11,785)            
Net issuance of shares to employee and other stock plans 0 (108) 0 0 58 (50)            
Stock-based compensation 0 648 0 0 0 648            
Other comprehensive income (loss) 0 0 0 (467) 0 (467)            
Balance at Sep. 30, 2020 $ 497 $ 577,737 $ 726,650 $ 2,021 $ (140,794) $ 1,166,111