Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net (loss) income	$ (120,301)	$ 65,581	$ 230,692
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	59,932	49,322	31,545
Equity-based compensation	13,145	14,088	5,109
Loss on debt restructure		1,676	462
Gain on lease termination.	(686)
Goodwill impairment		40,046
Long-lived asset impairment	66,270
Loss (gain) on disposal of assets	11,492	2,810	(133)
Provision for (gains) losses on accounts receivable	(20)	2,444	839
Non-cash lease expense	54,921
Accretion of original debt issuance discount	1,038	1,034	942
Non-cash interest	4,585	5,068	4,360
Deferred income taxes	14,897	11,364	130,966
Tax Receivable Agreement liability adjustment	(10,005)	1,324	(100,758)
Change in assets and liabilities, net of acquisitions:
Receivables and contracts in transit	12,217	(16,550)	(38,019)
Inventories	216,111	(99,610)	(342,780)
Prepaid expenses and other assets	(7,951)	(8,290)	(20,244)
Checks in excess of bank balance	(2,764)	3,942	6,585
Accounts payable and other accrued expenses	(12,586)	45,230	52,155
Payment pursuant to Tax Receivable Agreement	(9,425)	(8,914)	(203)
Accrued rent for cease-use locations		(488)	(91)
Deferred revenue and gains	708	12,448	12,943
Operating lease liabilities	(54,403)
Other, net	14,759	13,767	9,315
Net cash provided by (used in) operating activities	251,934	136,292	(16,315)
Investing activities
Purchases of property and equipment	(56,789)	(133,557)	(59,559)
Purchase of real property	(31,567)	(120,802)	(21,212)
Proceeds from the sale of real property	28,169	56,932	6,000
Purchases of businesses, net of cash acquired	(48,418)	(99,240)	(392,956)
Proceeds from sale of property and equipment	4,068	3,978	795
Purchase of intangible assets			(1,523)
Net cash used in investing activities	(104,537)	(292,689)	(468,455)
Financing activities
Net payments on notes payable - floor plan, net	(43,989)	(85,446)	358,478
Proceeds from credit facilities	11,663	329,775	299,246
Borrowings on revolving line of credit	14,029	45,164
Payments on revolving line of credit	(11,883)	(6,425)
Payments of principal on finance lease obligations		(844)	(1,198)
Payments of principal on long-term debt	(13,658)	(82,820)	(7,916)
Payments of principal on right-to-use liability		(161)	(150)
Payment of debt issuance costs	(47)	(3,345)	(4,604)
Proceeds from issuance of Class A common stock sold in a public offering net of underwriter discounts, commissions and offering expenses			121,395
Dividends on Class A common stock	(22,878)	(22,697)	(22,241)
Proceeds from exercise of stock options		153	1,728
RSU shares withheld for tax	(1,478)	(1,365)	(368)
Disgorgement of short-swing profits by Section 16 officer		557
Members' distributions	(70,192)	(101,755)	(149,633)
Net cash (used in) provided by financing activities	(138,433)	70,791	594,737
Increase (decrease) in cash and cash equivalents	8,964	(85,606)	109,967
Cash and cash equivalents at beginning of the period	138,557	224,163	114,196
Cash and cash equivalents at end of the period	$ 147,521	$ 138,557	$ 224,163