Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Revenue	$ 1,173,579	$ 1,225,882
Lease and rental	58,227	60,781
Total revenue	1,231,806	1,286,663
Cost of products sold
Lease and rental	48,058	52,208
Total cost of products sold	986,992	1,052,162
Gross profit	244,814	234,501
Selling, general and administrative expense	174,955	185,074
Depreciation and amortization expense	13,726	14,330
Gain on sale of assets	92	100
Operating income	56,225	35,197
Other income	919	1,241
Interest expense, net	507	4,769
Income before taxes	56,637	31,669
Income tax provision	11,304	8,562
Net income	$ 45,333	$ 23,107
Earnings per common share:
Basic (in dollars per share)	$ 0.82	$ 0.42
Diluted (in dollars per share)	$ 0.79	$ 0.41
Weighted average shares outstanding:
Basic (in shares)	55,567	54,727
Diluted (in shares)	57,734	55,989
Dividends declared per common share (in dollars per share)	$ 0.18	$ 0.09
Comprehensive income	$ 45,588	$ 21,177
New and Used Commercial Vehicle [Member]
Revenues
Revenue	747,719	789,554
Cost of products sold
Cost of products sold	677,092	728,539
Parts and Service [Member]
Revenues
Revenue	415,737	427,978
Cost of products sold
Cost of products sold	261,842	271,415
Finance and Insurance [Member]
Revenues
Revenue	6,465	4,467
Product and Service, Other [Member]
Revenues
Revenue	$ 3,658	$ 3,883