Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Net sales:
Net sales	$ 1,334,223	$ 1,163,466	[1]	$ 1,119,138	[1]
Cost of sales	999,709	869,736	[1]	845,647	[1]
Gross profit	334,514	293,730	[1]	273,491	[1]
Selling, general and administrative expenses	202,939	184,199	[1]	172,921	[1]
Amortization expense	14,637	14,746	[1]	5,658	[1]
Income from operations	116,938	94,785	[1]	94,912	[1]
Interest expense	(10,533)	(15,837)	[1]	(10,747)	[1]
Interest income	1,149	1,366	[1]	1,229	[1]
Other income	1,944	(557)	[1]	(795)	[1]
Income before income taxes	109,498	79,757	[1]	84,599	[1]
Provision for income taxes	29,253	21,953	[1]	21,496	[1]
Net income	$ 80,245	$ 57,804	[1]	$ 63,103	[2]
Net income per common share:
Basic (in dollars per share)	$ 6.78	$ 4.91	[1]	$ 5.38	[1]
Diluted (in dollars per share)	$ 6.75	$ 4.88	[1]	$ 5.35	[1]
Average common shares:
Basic (in shares)	11,837	11,782	[1]	11,729	[1]
Diluted (in shares)	11,896	11,845	[1]	11,800	[1]
Vegetation Management
Net sales:
Net sales	$ 812,676	$ 654,630	[1]	$ 502,194	[1]
Income from operations	78,917	46,651		34,035
Industrial Equipment
Net sales:
Net sales	521,547	508,836	[1]	616,944	[1]
Income from operations	$ 38,021	$ 48,134		$ 60,877

[1] Years ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements. 

[2] Years ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements.