Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues
Revenue	$ 1,491,867	$ 1,173,579
Lease and rental	71,335	58,227
Total revenue	1,563,202	1,231,806
Cost of products sold
Lease and rental	48,561	48,058
Total cost of products sold	1,217,762	986,992
Gross profit	345,440	244,814
Selling, general and administrative expense	224,447	174,955
Depreciation and amortization expense	13,674	13,726
Gain on sale of assets	180	92
Operating income	107,499	56,225
Other income	14,064	919
Interest expense, net	1,219	507
Income before taxes	120,344	56,637
Income tax provision	27,891	11,304
Net income	$ 92,453	$ 45,333
Earnings per common share:
Basic (in dollars per share)	$ 1.65	$ 0.82
Diluted (in dollars per share)	$ 1.60	$ 0.79
Weighted average shares outstanding:
Basic (in shares)	55,938	55,567
Diluted (in shares)	57,912	57,734
Dividends declared per common share (in dollars per share)	$ 0.19	$ 0.18
Comprehensive income	$ 92,898	$ 45,588
New and Used Commercial Vehicle [Member]
Revenues
Revenue	935,719	747,719
Cost of products sold
Cost of products sold	834,993	677,092
Parts and Service [Member]
Revenues
Revenue	543,263	415,737
Cost of products sold
Cost of products sold	334,208	261,842
Finance and Insurance [Member]
Revenues
Revenue	7,525	6,465
Product and Service, Other [Member]
Revenues
Revenue	$ 5,360	$ 3,658