Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
New and used commercial vehicle sales	$ 636,853	$ 917,878	$ 1,305,398	$ 1,718,072
Parts and service sales	328,665	353,268	670,604	690,290
Lease and rental	52,152	49,297	103,039	97,089
Finance and insurance	4,837	5,678	9,336	10,209
Other	3,955	4,182	8,925	8,178
Total revenue	1,026,462	1,330,303	2,097,302	2,523,838
Cost of products sold:
New and used commercial vehicle sales	591,331	856,274	1,214,991	1,600,534
Parts and service sales	209,519	222,225	427,762	436,922
Lease and rental	45,134	44,171	90,801	85,127
Total cost of products sold	845,984	1,122,670	1,733,554	2,122,583
Gross profit	180,478	207,633	363,748	401,255
Selling, general and administrative expense	146,080	161,309	308,532	313,936
Depreciation and amortization expense	12,821	10,829	25,468	20,823
Gain (loss) on sale of assets	(5)	65	5	(607)
Operating income	21,572	35,560	29,753	65,889
Interest expense, net	3,763	3,598	8,002	6,539
Income before taxes	17,809	31,962	21,751	59,350
Provision for income taxes	6,992	12,386	8,539	22,993
Net income	$ 10,817	$ 19,576	$ 13,212	$ 36,357
Earnings per common share:
Basic (in dollars per share)	$ 0.27	$ 0.49	$ 0.33	$ 0.91
Diluted (in dollars per share)	$ 0.27	$ 0.48	$ 0.32	$ 0.89
Weighted average shares outstanding:
Basic (in shares)	40,250	40,275	40,402	40,171
Diluted (in shares)	40,778	41,072	40,914	41,029
Comprehensive income	$ 10,828	$ 19,659	$ 13,223	$ 36,512