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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Cash Flows [Abstract]      
Cash and cash equivalents at beginning of year $ 144,397 $ 73,040 $ 84,166
Cash flows from operating activities:      
Net income 270,568 254,286 234,734
Adjustments to reconcile net income to cash flows from operating activities:      
Depreciation and amortization 84,002 87,560 71,759
Deferred income tax expense 7,554 7,384 14,527
Gain on sale of land (16,483) 0 0
Change in assets and liabilities:      
Trade and other accounts receivable, net 2,591 (22,587) 14,096
Inventories (33,111) 31,884 (29,672)
Prepaid expenses and other current assets (6,138) (2,742) 702
Accounts payable and accrued expenses 7,077 8,859 (19,638)
Operating lease liabilities (17,801) (16,496) 0
Other current liabilities 228 1,866 (10,169)
Income taxes payable (6,935) 3,979 (9,731)
Cash pension and postretirement contributions (10,655) (9,932) (64,756)
Other, net 3,257 (6,849) (3,941)
Cash provided from (used in) operating activities 284,154 337,212 197,911
Cash flows from investing activities:      
Capital expenditures (93,316) (59,434) (74,638)
Proceeds from sale of land 20,000 0 0
Other, net (927) 0 14,607
Cash provided from (used in) investing activities (74,243) (59,434) (60,031)
Cash flows from financing activities:      
Net (repayments) borrowings under revolving credit facility (44,678) (123,451) 168,129
Dividends paid (83,417) (81,676) (80,448)
Repurchases of common stock (101,434) 0 (232,016)
Other, net (1,934) (2,952) (1,092)
Cash provided from (used in) financing activities (231,463) (208,079) (145,427)
Effect of foreign exchange on cash and cash equivalents 2,327 1,658 (3,579)
(Decrease) increase in cash and cash equivalents (19,225) 71,357 (11,126)
Cash and cash equivalents at end of year $ 125,172 $ 144,397 $ 73,040