Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Sales
Sales	$ 1,879,451	$ 1,589,313	$ 6,143,928	$ 4,002,607
Costs and expenses
Materials, labor, and other operating expenses (excluding depreciation)	1,594,405	1,261,697	4,909,362	3,302,869
Depreciation and amortization	20,299	20,029	60,258	75,260
Selling and distribution expenses	114,466	122,884	366,119	325,913
General and administrative expenses	21,002	26,060	64,252	60,899
Loss on curtailment of facility	0	0	0	1,707
Other (income) expense, net	(107)	71	(485)	70
Total costs and expenses	1,750,065	1,430,741	5,399,506	3,766,718
Income from operations	129,386	158,572	744,422	235,889
Foreign currency exchange gain (loss)	(353)	265	(52)	(199)
Pension expense (excluding service costs)	(19)	(302)	(57)	(991)
Interest expense	(6,279)	(7,002)	(18,501)	(20,056)
Interest income	63	113	173	958
Change in fair value of interest rate swaps	59	147	1,058	(2,681)
Loss on extinguishment of debt	0	(13,968)	0	(13,968)
Total nonoperating income (expense)	(6,529)	(20,747)	(17,379)	(36,937)
Income before income taxes	122,857	137,825	727,043	198,952
Income tax provision	(31,158)	(34,633)	(183,632)	(49,974)
Net income	$ 91,699	$ 103,192	$ 543,411	$ 148,978
Weighted average common shares outstanding:
Basic (in shares)	39,442	39,315	39,413	39,264
Diluted (in shares)	39,661	39,526	39,623	39,396
Net income per common share:
Basic (in dollars per share)	$ 2.32	$ 2.62	$ 13.79	$ 3.79
Diluted (in dollars per share)	2.31	2.61	13.71	3.78
Dividends declared per common share	$ 0.10	$ 1.70	$ 2.30	$ 1.90