Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 80,871	$ 82,124
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	25,177	23,630
Deferred income taxes	7,984	8,100
ASSET IMPAIRMENTS	1,956	1,039
Stock-based compensation	10,169	9,453
Amortization of debt discount and issue costs	2,085	1,812
Gain (Loss) on Disposition of Assets	617	1,507
Tax effect from excess stock-based compensation	85	(1,439)
Other	499	2,278
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:
Accounts payable and accrued expenses	15,473	31,197
Accounts and notes receivable	8,564	1,399
Inventories	(22,080)	(88,738)
Contracts-in-transit and vehicle receivables	44,667	3,243
Prepaid expenses and other assets	15,573	3,427
Floorplan notes payable - manufacturer affiliates	(17,268)	4,876
Deferred revenues	(271)	(319)
Net cash provided by operating activities	172,867	80,575
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid in acquisitions, net of cash received	(54,739)	(130,783)
Proceeds from disposition of franchises, property and equipment	13,985	7,339
Purchases of property and equipment, including real estate	(70,272)	(48,486)
Other	3,156	6,294
Net cash used in investing activities	(107,870)	(165,636)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on credit facility - Floorplan Line	3,373,126	3,550,526
Repayments on credit facility - Floorplan Line	(3,325,917)	(3,466,772)
Borrowings on credit facility - acquisition line	150,020	346,050
Repayment on credit facility - acquisition line	(140,020)	(324,222)
Borrowings on other debt	19,653	25,744
Principal payments on other debt	(22,248)	(26,942)
Borrowings Of Long Term Debt Related To Real Estate Loans, Net of Debt Issue Costs	30,754	22,430
Principal payments of long-term debt related to real estate loans	(12,215)	(14,359)
Net Issuance of Common and Treasury Shares to Employee Stock Compensation Plans	136	(1,113)
Repurchases of common stock, amounts based on settlement date	(115,246)	(33,121)
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(85)	1,439
Dividends paid	(10,124)	(9,737)
Proceeds from (Payments for) Other Financing Activities	(3,159)	0
Net cash provided by (used in) financing activities	(55,325)	69,923
Effect of Exchange Rate on Cash and Cash Equivalents	2,256	(1,612)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	11,928	(16,750)
CASH AND CASH EQUIVALENTS, beginning of period	13,037	40,975
CASH AND CASH EQUIVALENTS, end of period	24,965	24,225
SUPPLEMENTAL CASH FLOW INFORMATION:
Purchases of property and equipment, including real estate, accrued in accounts payable and accrued expenses	$ 21,241	$ 5,731