Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net income	$ 15,427	$ 9,842
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,311	3,125
Loss on sale of assets	0	(9)
Share-based compensation	3,229	1,139
Deferred income taxes, including change in valuation allowance	(648)	101
Changes in operating assets and liabilities:
Receivables, net	(4,348)	(11,453)
Inventory	4,924	(5,649)
Prepaid expenses	(1,084)	(2,339)
Income taxes payable	5,237	3,100
Accounts payable	509	1,635
Accrued expenses and other	(8,385)	1,003
Deferred credits	(802)	(81)
Other, net	(380)	128
Net cash provided by operating activities	16,990	542
Cash Flows from Investing Activities
Additions to property, plant, and equipment	(12,059)	(5,645)
Acquisition of business	0	(2,750)
Proceeds from sale of property	0	366
Other, net	(1,281)	(160)
Net cash used in investing activities	(13,340)	(8,189)
Cash Flows from Financing Activities
Payment of dividends and dividend equivalents	(2,052)	(2,060)
Purchase of treasury stock	(674)	(4,395)
Loan fees paid related to borrowings	0	(1,148)
Principal payments on long-term debt	0	(100)
Proceeds from credit agreement - revolver	0	54,700
Net cash (used in) provided by financing activities	(2,726)	46,997
Increase in cash and cash equivalents	924	39,350
Cash and cash equivalents, beginning of period	21,662	3,309
Cash and cash equivalents, end of period	$ 22,586	$ 42,659