Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
New and used commercial vehicle sales	$ 698,838	$ 872,106	$ 2,004,236	$ 2,590,178
Parts and service sales	336,459	360,711	1,007,063	1,051,001
Lease and rental	52,452	50,545	155,491	147,634
Finance and insurance	4,870	6,164	14,206	16,373
Other	3,422	4,550	12,347	12,728
Total revenue	1,096,041	1,294,076	3,193,343	3,817,914
Cost of products sold:
New and used commercial vehicle sales	653,992	813,178	1,868,983	2,413,712
Parts and service sales	214,916	227,775	642,678	664,697
Lease and rental	45,817	45,115	136,618	130,242
Total cost of products sold	914,725	1,086,068	2,648,279	3,208,651
Gross profit	181,316	208,008	545,064	609,263
Selling, general and administrative expense	142,280	160,776	450,812	474,712
Depreciation and amortization expense	13,014	11,228	38,482	32,051
Gain (loss) on sale of assets	1,566	26	1,571	(581)
Operating income	27,588	36,030	57,341	101,919
Interest expense, net	3,285	3,568	11,287	10,107
Income before taxes	24,303	32,462	46,054	91,812
Provision for income taxes	9,423	12,579	17,962	35,572
Net income	$ 14,880	$ 19,883	$ 28,092	$ 56,240
Earnings per common share:
Basic (in dollars per share)	$ 0.38	$ 0.49	$ 0.70	$ 1.40
Diluted (in dollars per share)	$ 0.37	$ 0.48	$ 0.69	$ 1.37
Weighted average shares outstanding:
Basic (in shares)	39,617	40,361	40,138	40,235
Diluted (in shares)	40,274	41,136	40,698	41,065
Comprehensive income	$ 14,889	$ 19,883	$ 28,111	$ 56,395