Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net income	$ 203,237	$ 178,530	$ 123,626
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,695	24,101	24,601
Equity-based compensation	1,597
Loss on debt restructure	5,052		1,831
(Gain) loss on sale of assets	(564)	(237)	33
Provision for losses on accounts receivable	1,332	2,180	1,192
Accretion of original issue discount	1,127	1,010	848
Non-cash interest	4,543	5,897	1,345
Deferred tax expense (benefit)	3,765	(181)	1,175
Change in assets and liabilities, net of acquisitions:
Cash - restricted		25
Receivables and contracts in transit	(10,932)	(8,840)	(7,716)
Inventories	(31,987)	(111,586)	(115,304)
Prepaid expenses and other assets	(4,625)	(6,969)	(7,358)
Checks in excess of bank balance	(7,478)	6,192	(954)
Accounts payable and other accrued expenses	20,329	17,686	10,715
Accrued rent for cease-use locations	945	420	(117)
Deferred revenue and gains	4,988	3,847	9,410
Other, net	7,686	68	737
Net cash provided by operating activities	223,710	112,143	44,064
Investing activities
Purchases of property and equipment	(39,782)	(41,437)	(34,984)
Purchase of real property	(17,077)	(30,272)	(6,395)
Proceeds from the sale of real property	15,892	19,425	1,197
Purchases of businesses, net of cash acquired	(78,606)	(125,189)	(10,615)
Proceeds from sale of property and equipment	3,870	1,273	606
Purchase of intangible assets			(34)
Net cash used in investing activities	(115,703)	(176,200)	(50,225)
Financing activities
Proceeds from long-term debt	188,137	148,938	116,415
Payments on long-term debt	(288,520)	(36,647)	(13,870)
Net borrowings on notes payable - floor plan, net	26,765	167,387	47,926
Borrowings on revolver	12,000
Payments on revolver	(12,000)
Payments of principal on capital lease obligations	(1,465)	(737)	(688)
Payments of principal on right to use liability	(200)	(1,351)	(1,395)
Payments on credit facilities			(5,000)
Payment of debt issuance costs	(7,084)	(3,324)	(2,921)
Proceeds from issuance of Class A common stock sold in an initial pubic offering net of underwriter discounts and commissions	234,185
Proceeds from issuance of Class B common stock	7
Dividends on Class A common stock	(1,515)
Members' distributions	(236,146)	(228,894)	(60,101)
Net cash (used in) provided by financing activities	(85,836)	45,372	80,366
Increase (decrease) in cash	22,171	(18,685)	74,205
Cash at beginning of year	92,025	110,710	36,505
Cash at end of year	$ 114,196	$ 92,025	$ 110,710