Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES
Net income	$ 174,549	$ 183,705
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,269	25,604
Stock-based compensation	3,531	6,195
Gain on disposal of property, plant and equipment	(43)	(1,057)
Other non-cash adjustments	(171)	(40)
Changes in operating assets and liabilities:
Accounts receivable	62,343	(158,813)
Inventories	(48,362)	(5,399)
Prepaid expenses and other assets	7,125	(4,311)
Accounts payable	(3,769)	17,219
Accrued expenses and other liabilities	8,842	28,472
Income taxes receivable/payable	7,079	21,484
Net cash provided by operating activities	244,393	113,059
INVESTING ACTIVITIES
Expenditures for property, plant and equipment	(108,163)	(124,451)
Proceeds from sales of property, plant and equipment	45	1,355
Net cash used in investing activities	(108,118)	(123,096)
FINANCING ACTIVITIES
Borrowings under line of credit	156,000	416,000
Principal payments under line of credit	(80,000)	(416,000)
Repurchases of common stock	(347,957)	(58,945)
Proceeds from employee stock purchase and option plans	1,381	1,323
Financing costs	(867)
Net cash used in financing activities	(271,443)	(57,622)
Net decrease in cash and cash equivalents	(135,168)	(67,659)
Cash and cash equivalents, beginning of period	141,053	121,701
Cash and cash equivalents, end of period	5,885	54,042
Supplemental Disclosure:
Cash paid for interest, net of capitalized interest	0	0
Cash paid for income taxes, net	$ 50,585	$ 39,750