Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income (loss)	$ 344,215	$ (120,301)	$ 65,581
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	51,981	59,932	49,322
Equity-based compensation	20,661	13,145	14,088
Loss on debt restructure			1,676
Loss (gain) on lease termination	4,547	(686)
Goodwill impairment			40,046
Long-lived asset impairment	12,353	66,270
Loss on disposal of assets	1,332	11,492	2,810
Provision for losses on accounts receivable	1,068	(20)	2,444
Non-cash lease expense	57,536	54,921
Accretion of original debt issuance discount	1,079	1,038	1,034
Non-cash interest	4,306	4,585	5,068
Deferred income taxes	6,606	14,897	11,364
Tax Receivable Agreement liability adjustment	(141)	(10,005)	1,324
Change in assets and liabilities, net of acquisitions:
Receivables and contracts in transit	(2,777)	12,217	(16,550)
Inventories	239,334	216,111	(99,610)
Prepaid expenses and other assets	(3,016)	(7,951)	(8,290)
Accounts payable and other accrued expenses	39,846	(15,350)	49,172
Payment pursuant to Tax Receivable Agreement	(6,563)	(9,425)	(8,914)
Accrued rent for cease-use locations			(488)
Deferred revenue	4,560	708	12,448
Operating lease liabilities	(68,951)	(54,403)
CARES Act deferral of payroll taxes	29,231
Other, net	10,462	14,759	13,767
Net cash provided by operating activities	747,669	251,934	136,292
Investing activities
Purchases of property and equipment	(31,845)	(56,789)	(133,557)
Purchase of real property	(53,078)	(31,567)	(120,802)
Proceeds from the sale of real property	7,484	28,169	56,932
Purchases of businesses, net of cash acquired	(47,571)	(48,418)	(99,240)
Purchase of equity securities	(2,500)
Proceeds from sale of property and equipment	1,751	4,068	3,978
Purchases of intangible assets	(176)
Net cash used in investing activities	(125,935)	(104,537)	(292,689)
Financing activities
Proceeds from long-term debt		11,663	329,775
Payments on long-term debt	(39,070)	(13,658)	(83,825)
Net payments on notes payable - floor plan, net	(324,485)	(43,989)	(85,446)
Borrowings on revolving line of credit		14,029	45,164
Payments on revolving line of credit	(20,000)	(11,883)	(6,425)
Payment of debt issuance costs		(47)	(3,345)
Dividends on Class A common stock	(61,025)	(22,878)	(22,697)
Proceeds from exercise of stock options	4,635		153
RSU shares withheld for tax	(4,742)	(1,478)	(1,365)
Repurchases of Class A common stock to treasury stock	(21,522)
Disgorgement of short-swing profits by Section 16 officer			557
Distributions to holders of LLC common units	(136,974)	(70,192)	(101,755)
Net cash (used in) provided by financing activities	(603,183)	(138,433)	70,791
Increase (decrease) in cash and cash equivalents	18,551	8,964	(85,606)
Cash and cash equivalents at beginning of the period	147,521	138,557	224,163
Cash and cash equivalents at end of the period	$ 166,072	$ 147,521	$ 138,557