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Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenue	$ 1,289,838		$ 2,473,095
Lease and rental sales	58,993	$ 53,048	116,517	$ 104,292
Total revenue	1,348,831	1,203,523	2,589,612	2,248,320
Cost of products sold:
Lease and rental sales	48,663	44,206	97,091	88,510
Total cost of products sold	1,105,454	994,451	2,119,240	1,851,341
Gross profit	243,377	209,072	470,372	396,979
Selling, general and administrative expense	178,654	159,353	350,324	309,756
Depreciation and amortization expense	21,693	12,444	44,601	24,936
Gain (loss) on sale of assets	396	132	368	(31)
Operating income	43,426	37,407	75,815	62,256
Interest expense, net	4,494	2,824	8,800	5,615
Income before taxes	38,932	34,583	67,015	56,641
Provision for income taxes	9,543	12,584	16,587	20,163
Net income	$ 29,389	$ 21,999	$ 50,428	$ 36,478
Earnings per common share:
Basic (in dollars per share)	$ 0.75	$ 0.55	$ 1.27	$ 0.92
Diluted (in dollars per share)	$ 0.72	$ 0.54	$ 1.23	$ 0.90
Weighted average shares outstanding:
Basic (in shares)	39,399	39,641	39,567	39,493
Diluted (in shares)	40,690	40,839	40,967	40,737
Comprehensive income	$ 29,389	$ 22,285	$ 50,428	$ 36,764
New and Used Commercial Vehicle [Member]
Revenues:
Revenue	857,025	775,988	1,630,125	1,411,941
Cost of products sold:
Cost of products sold	791,608	718,253	1,502,522	1,306,373
Aftermarket Products and Services [Member]
Revenues:
Revenue	422,940	366,599	823,235	716,705
Cost of products sold:
Cost of products sold	265,183	231,992	519,627	456,458
Finance and Insurance [Member]
Revenues:
Revenue	5,492	4,392	10,233	8,321
Product and Service, Other [Member]
Revenues:
Revenue	$ 4,381	$ 3,496	$ 9,502	$ 7,061

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