Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net income	$ 184,626	$ 208,737	$ 175,631
Adjustments to reconcile net income to net cash provided by operating activities:
Goodwill impairment		54,245	0
Depreciation and amortization	44,298	35,946	17,939
Deferred income taxes	24,256	21,012	13,125
Loss on sale	15,423
Stock-based compensation	5,329	8,438	7,131
Gain on disposal of property, plant and equipment	(27)	(45)	(56)
Other non-cash adjustments	(117)	40	51
Changes in operating assets and liabilities:
Accounts receivable	42,513	(44,349)	(28,286)
Inventories	(64,454)	(15,515)	(12,132)
Prepaid expenses and other assets	7,925	(8,715)	(358)
Accounts payable	(5,595)	(3,473)	11,353
Accrued expenses and other liabilities	(14,385)	(5,285)	7,655
Income taxes receivable/payable	(23,572)	7,028	(4,759)
Net cash provided by operating activities	216,220	258,064	187,294
Investing Activities
Expenditures for property, plant and equipment	(176,228)	(159,394)	(172,823)
Proceeds from sale of assets	7,290
Proceeds from sales of property, plant and equipment	54	1,355	2,165
Net cash used in investing activities	(168,884)	(158,039)	(170,658)
Financing Activities
Borrowings under line of credit	425,000	494,500	276,000
Principal payments under line of credit	(203,000)	(494,500)	(276,000)
Repurchases of common stock	(398,382)	(82,473)	(44,854)
Proceeds from employee stock purchase and option plans	1,742	1,800	1,446
Financing costs	(1,424)	0	(360)
Net cash used in financing activities	(176,064)	(80,673)	(43,768)
Net decrease increase in cash and cash equivalents	(128,728)	19,352	(27,132)
Cash and cash equivalents at beginning of year	141,053	121,701	148,833
Cash and cash equivalents at end of year	12,325	141,053	121,701
Supplemental disclosures of cash flow information:
Cash paid for interest, net of capitalized interest	0	0	0
Cash paid for income taxes, net	59,934	38,614	50,744
Capital expenditures in accounts payable	$ 1,814	$ 2,564	$ 12,853