CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (8,076)	$ (75,920)	$ (6,115)
Adjustments to reconcile net loss to net cash provided by operations:
Depreciation and amortization expense	77,896	57,869	41,055
Non-cash operating lease costs	18,814	19,719	0
Deferred income taxes - net	1,196	(4,607)	(3,595)
Loss on sale of assets	742	3,269	1,123
Business casualty loss	0	(626)	3,549
Loss on extinguishment of debt	11,545	5,469	72
Amortization of deferred financing costs	5,517	4,544	3,107
Loss on interest rate swaps upon discontinuing hedge accounting	3,746	0	0
Paid-in-kind interest capitalized as principal	7,525	12,256	0
Equity in earnings of joint ventures	(3,313)	(2,840)	(1,020)
Stock-based incentive compensation expense	2,920	4,170	2,139
Interest on management notes receivable	0	(62)	(78)
Capital distribution from equity method investments	3,250	500	2,000
Change in contingent consideration liability	(1,500)	(300)	0
Changes in operating assets and liabilities:
Accounts receivable, net	(3,924)	82,285	(21,012)
Inventories	(42,725)	(12,853)	2,965
Prepaid expenses and other current assets	(19,500)	(2,940)	(4,715)
Accounts payable	59,215	(30,856)	10,965
Accrued compensation and employee benefits	13,134	2,671	(5,586)
Accrued expenses and other current liabilities	22,809	(317)	(1,740)
Operating lease liabilities	(18,089)	(17,253)	0
Other noncurrent assets and liabilities	(3,790)	(4,711)	1,314
Net cash provided by operating activities	127,392	39,467	24,428
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(26,875)	(28,292)	(26,276)
Proceeds from sale of assets	0	10	0
Insurance proceeds from business casualty loss	0	626	0
Business acquisitions, net of cash acquired	0	(700,170)	(10,727)
Other investing cash flows	541	0	0
Net cash used in investing activities	(26,334)	(727,826)	(37,003)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemptions to related parties	0	(2,000)	0
Sale of management notes receivable	0	1,310	0
Exercise of stock options, vesting of restricted stock, and related tax withholdings	(904)	(2,501)	0
Net proceeds from issuance of common stock	118,934	0	0
Proceeds from debt	0	981,050	1,000
Repayments of debt principal	(9,250)	(2,075)	(5,150)
Retirement of debt obligations	(174,000)	(226,738)	0
Deferred financing costs	(149)	(30,022)	0
Debt prepayment fees	(3,480)	0	0
Net cash (used in) provided by financing activities	(68,849)	719,024	(4,150)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	32,209	30,665	(16,725)
Cash and cash equivalents - beginning of the period	67,056	36,391	53,116
CASH AND CASH EQUIVALENTS - END OF PERIOD	99,265	67,056	36,391
Supplemental disclosure of cash flow information:
Cash paid for interest	97,640	50,808	47,173
Cash paid for income taxes	2,884	2,405	$ 1,600
Cash paid for operating leases	$ 26,809	$ 18,992