Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 127,054	$ 102,953
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,961	42,758
Deferred income taxes	4,088	16,102
Asset impairments	27,427	9,526
Stock-based compensation	14,241	14,606
Amortization of debt discount and issue costs	2,475	2,852
Gain on disposition of assets	(26,964)	(848)
Other	589	(548)
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Accounts payable and accrued expenses	35,481	85,163
Accounts and notes receivable	28,431	(8,892)
Inventories	33,737	68,454
Contracts-in-transit and vehicle receivables	70,211	(15,273)
Prepaid expenses and other assets	(22,461)	(4,930)
Floorplan notes payable - manufacturer affiliates	13,923	(5,164)
Deferred revenues	(778)	475
Net cash provided by operating activities	357,415	307,234
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid in acquisitions, net of cash received	(135,342)	(109,082)
Proceeds from disposition of franchises, property and equipment	107,704	5,133
Purchases of property and equipment, including real estate	(118,215)	(144,310)
Deposits for real estate and dealership acquisitions	381	0
Other	0	1,526
Net cash used in investing activities	(145,472)	(246,733)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility - floorplan line and other	5,106,810	5,053,598
Repayments on credit facility - floorplan line and other	(5,185,225)	(5,108,475)
Borrowings on credit facility - acquisition line	98,596	68,085
Repayments on credit facility - acquisition line	(91,450)	(35,576)
Borrowings on other debt	123,298	126,316
Principal payments on other debt	(105,551)	(88,701)
Borrowings on debt related to real estate, net of debt issue costs	54,712	39,031
Principal payments on debt related to real estate	(83,242)	(21,269)
Employee stock purchase plan purchases, net of employee tax withholdings	1,529	4,196
Proceeds from termination of mortgage swap	918	0
Repurchases of common stock, amounts based on settlement date	(108,623)	(40,094)
Dividends paid	(16,014)	(15,221)
Net cash used in financing activities	(204,242)	(18,110)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(2,941)	867
NET INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	4,760	43,258
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period	29,631	24,246
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	34,391	67,504
SUPPLEMENTAL CASH FLOW INFORMATION:
Purchases of property and equipment, including real estate, accrued in accounts payable	$ 6,131	$ 10,364