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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Total
Balance at Dec. 31, 2019 $ 21,443   $ 832,113 $ (23,223) $ 830,333
Balance (in shares) at Dec. 31, 2019 214,423        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ 100 $ 1,997     2,097
Stock issued for stock incentive plans, net (in shares) 1,014        
Stock purchased and retired $ (17) (1,997) 1,222   (792)
Stock purchased and retired (in shares) (177)        
Net income (loss)     (160,423)   (160,423)
Pension adjustment, net of taxes       732 732
Foreign currency translation       (712) (712)
Balance at Mar. 31, 2020 $ 21,526   672,912 (23,203) 671,235
Balance (in shares) at Mar. 31, 2020 215,260        
Balance at Dec. 31, 2019 $ 21,443   832,113 (23,223) 830,333
Balance (in shares) at Dec. 31, 2019 214,423        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         (201,953)
Foreign currency translation         (423)
Balance at Sep. 30, 2020 $ 21,507   638,590 (22,542) 637,555
Balance (in shares) at Sep. 30, 2020 215,067        
Balance at Mar. 31, 2020 $ 21,526   672,912 (23,203) 671,235
Balance (in shares) at Mar. 31, 2020 215,260        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ (4) 2,021     2,017
Stock issued for stock incentive plans, net (in shares) (135)        
Stock purchased and retired $ (10) (2,021) 2,025   (6)
Stock purchased and retired (in shares) (2)        
Net income (loss)     (25,093)   (25,093)
Pension adjustment, net of taxes       186 186
Foreign currency translation       314 314
Balance at Jun. 30, 2020 $ 21,512   649,844 (22,703) 648,653
Balance (in shares) at Jun. 30, 2020 215,123        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ (5) 5,212     5,207
Stock issued for stock incentive plans, net (in shares) (54)        
Stock purchased and retired   (5,212) 5,183   (29)
Stock purchased and retired (in shares) (2)        
Net income (loss)     (16,437)   (16,437)
Pension adjustment, net of taxes       186 186
Foreign currency translation       (25) (25)
Balance at Sep. 30, 2020 $ 21,507   638,590 (22,542) 637,555
Balance (in shares) at Sep. 30, 2020 215,067        
Balance at Dec. 31, 2020 $ 21,495   627,778 (17,706) 631,567
Balance (in shares) at Dec. 31, 2020 214,951        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ 93 1,446     1,539
Stock issued for stock incentive plans, net (in shares) 924        
Stock purchased and retired $ (14) (1,446) 903   (557)
Stock purchased and retired (in shares) (140)        
Net income (loss)     (9,662)   (9,662)
Pension adjustment, net of taxes       153 153
Foreign currency translation       136 136
Balance at Mar. 31, 2021 $ 21,574   619,019 (17,417) 623,176
Balance (in shares) at Mar. 31, 2021 215,735        
Balance at Dec. 31, 2020 $ 21,495   627,778 (17,706) 631,567
Balance (in shares) at Dec. 31, 2020 214,951        
Increase (Decrease) in Stockholders' Equity          
Net income (loss)         (5,122)
Foreign currency translation         (34)
Balance at Sep. 30, 2021 $ 21,564   626,501 (17,282) 630,783
Balance (in shares) at Sep. 30, 2021 215,643        
Balance at Mar. 31, 2021 $ 21,574   619,019 (17,417) 623,176
Balance (in shares) at Mar. 31, 2021 215,735        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ (1) 1,472     1,471
Stock issued for stock incentive plans, net (in shares) (9)        
Stock purchased and retired   (1,472) 1,463   (9)
Stock purchased and retired (in shares) (1)        
Net income (loss)     (726)   (726)
Pension adjustment, net of taxes       153 153
Foreign currency translation       69 69
Balance at Jun. 30, 2021 $ 21,573   619,756 (17,195) 624,134
Balance (in shares) at Jun. 30, 2021 215,725        
Increase (Decrease) in Stockholders' Equity          
Stock issued for stock incentive plans, net $ (9) 1,480     1,471
Stock issued for stock incentive plans, net (in shares) (82)        
Stock purchased and retired   $ (1,480) 1,479   (1)
Net income (loss)     5,266   5,266
Pension adjustment, net of taxes       152 152
Foreign currency translation       (239) (239)
Balance at Sep. 30, 2021 $ 21,564   $ 626,501 $ (17,282) $ 630,783
Balance (in shares) at Sep. 30, 2021 215,643