Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
OPERATING ACTIVITIES
Net income	$ 118,167	$ 160,127
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,198	21,804
Stock-based compensation	4,562	3,282
Gain on disposal of property, plant and equipment	1,081	(43)
Other non-cash adjustments	(388)	(365)
Changes in operating assets and liabilities:
Accounts receivable	(168,751)	(26,988)
Inventories	67,348	(17,119)
Prepaid expenses and other assets	2,046	949
Accounts payable	13,816	32,943
Accrued expenses and other liabilities	20,686	13,175
Income taxes receivable/payable	25,016	2,227
Net cash provided by operating activities	107,781	189,992
INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(82,357)	(66,606)
Proceeds from sales of property, plant and equipment		45
Net cash used in investing activities	(82,357)	(66,561)
FINANCING ACTIVITIES
Borrowings under line of credit	330,000
Principal payments under line of credit	(346,000)
Repurchases of common stock	(18,192)	(247,921)
Proceeds from employee stock purchase and option plans	639	951
Financing costs	30	(866)
Net cash used in financing activities	(33,523)	(247,836)
Net decrease in cash and cash equivalents	(8,099)	(124,405)
Cash and cash equivalents, beginning of period	12,325	141,053
Cash and cash equivalents, end of period	4,226	16,648
Supplemental Disclosure:
Cash paid for interest, net of capitalized interest	2,602
Cash paid for income taxes, net	15,348	48,915
Supplemental non-cash investing and financing disclosure:
Capital expenditures in accounts payable	$ 1,523	$ 21