Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 92,277	$ 73,072
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	32,980	27,699
Deferred income taxes	5,591	11,095
Asset impairments	4,268	0
Stock-based compensation	9,891	10,459
Amortization of debt discount and issue costs	1,526	1,849
Gain on disposition of assets	(20,686)	(314)
Other	65	(676)
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Accounts payable and accrued expenses	26,121	(28,480)
Accounts and notes receivable	21,185	13,582
Inventories	47,272	(142,165)
Contracts-in-transit and vehicle receivables	56,725	53,405
Prepaid expenses and other assets	(9,842)	(4,900)
Floorplan notes payable - manufacturer affiliates	(3,535)	37,779
Deferred revenues	(732)	(243)
Net cash provided by operating activities	263,106	52,162
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid in acquisitions, net of cash received	(74,865)	(95)
Proceeds from disposition of franchises, property and equipment	75,923	2,582
Purchases of property and equipment, including real estate	(88,230)	(67,266)
Deposits for real estate and dealership acquisitions	(655)	(57,099)
Other	0	2,074
Net cash used in investing activities	(87,827)	(119,804)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility - floorplan line and other	3,323,798	3,369,580
Repayments on credit facility - floorplan line and other	(3,461,494)	(3,288,367)
Borrowings on credit facility - acquisition line	98,596	47,509
Repayments on credit facility - acquisition line	(84,884)	(15,000)
Borrowings on other debt	111,142	5,137
Principal payments on other debt	(75,784)	(542)
Borrowings on debt related to real estate, net of debt issue costs	54,711	12,901
Principal payments on debt related to real estate	(63,368)	(13,897)
Employee stock purchase plan purchases, net of employee tax withholdings	11	2,487
Proceeds from termination of mortgage swap	918	0
Repurchases of common stock, amounts based on settlement date	(51,276)	(39,025)
Dividends paid	(10,836)	(10,200)
Net cash provided by (used in) financing activities	(158,466)	70,583
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(2,812)	117
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	14,001	3,058
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	29,631	24,246
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	43,632	27,304
SUPPLEMENTAL CASH FLOW INFORMATION:
Purchases of property and equipment, including real estate, accrued in accounts payable	$ 8,630	$ 11,105