Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
REVENUES:
New vehicle retail sales	$ 1,513,590	$ 1,337,213
Used vehicle retail sales	780,570	660,927
Used vehicle wholesale sales	104,029	104,157
Parts and service sales	349,515	319,698
Finance, insurance and other, net	112,322	96,834
Total revenues	2,860,026	2,518,829
COST OF SALES:
New vehicle retail sales	1,438,163	1,267,986
Used vehicle retail sales	737,075	615,922
Used vehicle wholesale sales	102,374	104,057
Parts and service sales	162,651	147,342
Total cost of sales	2,440,263	2,135,307
GROSS PROFIT	419,763	383,522
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	324,347	289,779
DEPRECIATION AND AMORTIZATION EXPENSE	16,342	13,606
ASSET IMPAIRMENTS	0
INCOME FROM OPERATIONS	79,074	80,137
OTHER EXPENSE:
Floorplan interest expense	(14,087)	(11,942)
Other interest expense, net	(18,820)	(16,999)
INCOME BEFORE INCOME TAXES	46,167	51,196
PROVISION FOR INCOME TAXES	(10,353)	(17,257)
NET INCOME	$ 35,814	$ 33,939
BASIC EARNINGS PER SHARE	$ 1.70	$ 1.58
Weighted average common shares outstanding	20,298	20,692
DILUTED EARNINGS PER SHARE	$ 1.70	$ 1.58
Weighted average common shares outstanding	20,307	20,698
CASH DIVIDENDS PER COMMON SHARE	$ 0.26	$ 0.24