UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (75,920)	$ (6,115)	$ 3,878
Adjustments to reconcile net (loss) income to net cash provided by operations:
Depreciation and amortization expense	57,869	41,055	38,062
Non-cash operating lease costs	19,719	0	0
Deferred income taxes - net	(4,607)	(3,595)	(19,804)
Loss on sale of assets	3,269	1,123	999
Business casualty loss	(626)	3,549	0
Loss on extinguishment of debt	5,469	72	0
Amortization of deferred financing costs	4,544	3,107	2,996
Paid-in-kind interest capitalized as principal	12,256	0	0
Equity in earnings of joint ventures	(2,840)	(1,020)	(2,186)
Stock-based incentive compensation expense	4,170	2,139	1,455
Interest on management notes receivable	(62)	(78)	(56)
Capital distribution from equity method investments	500	2,000	1,250
Change in contingent consideration liability	(300)	0	0
Changes in operating assets and liabilities:
Accounts receivable, net	82,285	(21,012)	(34,003)
Inventories	(12,853)	2,965	(3,481)
Prepaid expenses and other current assets	(2,940)	(4,715)	12,452
Accounts payable	(30,856)	10,965	47,411
Accrued compensation and employee benefits	2,671	(5,586)	(12,246)
Accrued expenses and other current liabilities	(317)	(1,740)	(4,095)
Operating lease liabilities	(17,253)	0	0
Other noncurrent assets and liabilities	(4,711)	1,314	5,239
Net cash provided by operating activities	39,467	24,428	37,871
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property and equipment	(28,292)	(26,276)	(24,956)
Proceeds from sale of assets	10	0	484
Insurance proceeds from business casualty loss	626	0	0
Business acquisitions, net of cash acquired	(700,170)	(10,727)	0
Net cash used in investing activities	(727,826)	(37,003)	(24,472)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redemptions to related parties	(2,000)	0	0
Sale of management notes receivable	1,310	0	0
Exercise of stock options, vesting of restricted stock, and related tax withholdings	(2,501)	0	0
Payment of contingent consideration liability	0	0	(1,000)
Proceeds from debt	981,050	1,000	0
Repayments of debt principal	(2,075)	(5,150)	(4,150)
Retirement of debt obligations	(226,738)	0	0
Deferred financing costs	(30,022)	0	0
Net cash provided by (used in) financing activities	719,024	(4,150)	(5,150)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	30,665	(16,725)	8,249
Cash and cash equivalents - beginning of the period	36,391	53,116	44,867
CASH AND CASH EQUIVALENTS - END OF PERIOD	67,056	36,391	53,116
Supplemental disclosure of cash flow information:
Cash paid for interest	50,808	47,173	43,485
Cash paid for income taxes	2,405	1,600	$ 1,194
Cash paid for operating leases	$ 18,992