Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (189,479)	$ (55,253)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	27,619	56,489
Asset impairment	97,115	0
Inventory and other write-downs	4,846	0
Gain (loss) on derivative	3,050	0
Accretion on asset retirement obligation	998	172
Change in allowance for doubtful accounts	4,425	322
Amortization of deferred financing costs	2,251	1,155
Amortization of debt discount	2,181	525
Non-cash compensation	1,233	6,851
Loss on disposal of assets	2,297	1,797
Deferred income taxes	(3,984)	0
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	62,963	9,228
Inventories	2,903	4,554
Prepaid expenses and other current assets	2,192	4,778
Other assets	651	46
Accounts payable	(14,130)	(21,548)
Income tax receivable	0	891
Other liabilities	(4,901)	(3,068)
Accrued expenses	(7,842)	4,311
Net cash (used in) provided by operating activities	(5,612)	11,250
Cash flows from investing activities:
Purchase of property and equipment	(5,947)	(33,359)
Proceeds from sale of assets	44,952	5,009
Payments for other long-term assets	(768)	0
Payments for businesses, net of cash acquired	(59,350)	0
Net cash used in investing activities	(21,113)	(28,350)
Cash flows from financing activities:
Proceeds from debt	38,000	0
Repayments of debt	(34,770)	(17,334)
Change in treasury stock including restricted stock issuances	(16)	(1,683)
Deferred loan costs and other financing activities	(1,749)	(469)
Net cash (used in) provided by financing activities	1,465	(19,486)
Net decrease in cash, cash equivalents and restricted cash	(25,260)	(36,586)
Cash and cash equivalents - beginning of period	36,217	90,300
Cash and cash equivalents - end of period	10,957	53,714
Noncash investing and financing activity:
Capital leases and notes issued for equipment	498	7,588
Change in accrued property and equipment	(131)	1,348
Issuance of Series A Participating Preferred Stock	22,000	0
Issuance of derivative liability	9,713	0
Change in asset retirement obligations	$ 8	$ 108