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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - 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, 2017 | $ 21,654 |  | $ 906,745 | $ (16,702) | $ 911,697
Balance (in shares) at Dec. 31, 2017 | 216,544 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock issued for stock incentive plans, net | $ 50 | $ 2,505 |  |  | 2,555
Stock issued for stock incentive plans, net (in shares) | 498 |  |  |  |
Stock purchased and retired | $ (157) | (2,505) | (28,048) |  | (30,710)
Stock purchased and retired (in shares) | (1,573) |  |  |  |
Net (loss) income |  |  | 52,130 |  | 52,130
Dividends |  |  | (21,657) |  | (21,657)
Pension adjustment, net of taxes |  |  |  | 173 | 173
Foreign currency translation |  |  |  | (481) | (481)
Balance at Mar. 31, 2018 | $ 21,547 |  | 909,185 | (17,025) | 913,707
Balance (in shares) at Mar. 31, 2018 | 215,469 |  |  |  |
Balance at Dec. 31, 2017 | $ 21,654 |  | 906,745 | (16,702) | 911,697
Balance (in shares) at Dec. 31, 2017 | 216,544 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income |  |  |  |  | 162,040
Foreign currency translation |  |  |  |  | (29)
Balance at Sep. 30, 2018 | $ 21,480 |  | 971,382 | (16,261) | 976,601
Balance (in shares) at Sep. 30, 2018 | 214,798 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Adoption of accounting standards (Note 2) |  |  | 15 | (15) |
Balance at Mar. 31, 2018 | $ 21,547 |  | 909,185 | (17,025) | 913,707
Balance (in shares) at Mar. 31, 2018 | 215,469 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock issued for stock incentive plans, net | $ (8) | 2,039 |  |  | 2,031
Stock issued for stock incentive plans, net (in shares) | (82) |  |  |  |
Stock purchased and retired | $ (56) | (2,039) | (7,291) |  | (9,386)
Stock purchased and retired (in shares) | (560) |  |  |  |
Net (loss) income |  |  | 59,943 |  | 59,943
Dividends |  |  | (21,529) |  | (21,529)
Pension adjustment, net of taxes |  |  |  | 155 | 155
Foreign currency translation |  |  |  | 66 | 66
Balance at Jun. 30, 2018 | $ 21,483 |  | 940,308 | (16,804) | 944,987
Balance (in shares) at Jun. 30, 2018 | 214,827 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock issued for stock incentive plans, net | $ (3) | 2,621 |  |  | 2,618
Stock issued for stock incentive plans, net (in shares) | (25) |  |  |  |
Stock purchased and retired | $ 0 | (2,621) | 2,557 |  | (64)
Stock purchased and retired (in shares) | (4) |  |  |  |
Net (loss) income |  |  | 49,967 |  | 49,967
Dividends |  |  | (21,450) |  | (21,450)
Pension adjustment, net of taxes |  |  |  | 157 | 157
Foreign currency translation |  |  |  | 386 | 386
Balance at Sep. 30, 2018 | $ 21,480 |  | 971,382 | (16,261) | 976,601
Balance (in shares) at Sep. 30, 2018 | 214,798 |  |  |  |
Balance at Dec. 31, 2018 | $ 21,454 |  | 947,711 | (18,746) | 950,419
Balance (in shares) at Dec. 31, 2018 | 214,544 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock issued for stock incentive plans, net | $ 84 | 2,368 |  |  | 2,452
Stock issued for stock incentive plans, net (in shares) | 843 |  |  |  |
Stock purchased and retired | $ (24) | (2,368) | (306) |  | (2,698)
Stock purchased and retired (in shares) | (245) |  |  |  |
Net (loss) income |  |  | (739) |  | (739)
Dividends |  |  | (21,486) |  | (21,486)
Pension adjustment, net of taxes |  |  |  | 173 | 173
Foreign currency translation |  |  |  | 98 | 98
Balance at Mar. 31, 2019 | $ 21,514 |  | 927,556 | (21,207) | 927,863
Balance (in shares) at Mar. 31, 2019 | 215,142 |  |  |  |
Balance at Dec. 31, 2018 | $ 21,454 |  | 947,711 | (18,746) | 950,419
Balance (in shares) at Dec. 31, 2018 | 214,544 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net (loss) income |  |  |  |  | (63,749)
Foreign currency translation |  |  |  |  | 513
Balance at Sep. 30, 2019 | $ 21,450 |  | 854,170 | (20,445) | 855,175
Balance (in shares) at Sep. 30, 2019 | 214,500 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Adoption of accounting standards (Note 2) |  |  | 2,376 | (2,732) | (356)
Balance at Mar. 31, 2019 | $ 21,514 |  | 927,556 | (21,207) | 927,863
Balance (in shares) at Mar. 31, 2019 | 215,142 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Stock issued for stock incentive plans, net | $ (2) | 2,438 |  |  | 2,436
Stock issued for stock incentive plans, net (in shares) | (23) |  |  |  |
Stock purchased and retired | $ (54) | (2,438) | (2,159) |  | (4,651)
Stock purchased and retired (in shares) | (540) |  |  |  |
Net (loss) income |  |  | 6,171 |  | 6,171
Dividends |  |  | (10,738) |  | (10,738)
Pension adjustment, net of taxes |  |  |  | 174 | 174
Foreign currency translation |  |  |  | 333 | 333
Balance at Jun. 30, 2019 | $ 21,458 |  | 920,917 | (20,700) | 921,675
Balance (in shares) at Jun. 30, 2019 | 214,579 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Adoption of accounting standards (Note 2) |  |  | 87 |  | 87
Stock issued for stock incentive plans, net | $ (8) | 2,444 |  |  | 2,436
Stock issued for stock incentive plans, net (in shares) | (77) |  |  |  |
Stock purchased and retired |  | $ (2,444) | 2,434 |  | (10)
Stock purchased and retired (in shares) | (2) |  |  |  |
Net (loss) income |  |  | (69,181) |  | (69,181)
Pension adjustment, net of taxes |  |  |  | 173 | 173
Foreign currency translation |  |  |  | 82 | 82
Balance at Sep. 30, 2019 | $ 21,450 |  | $ 854,170 | $ (20,445) | $ 855,175
Balance (in shares) at Sep. 30, 2019 | 214,500 |  |  |  |

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