Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss		$ (181,898)	$ (144,597)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	[1]	114,657	126,417
Asset impairment	[1]	35,801	0
Inventory and other write-downs	[1]	10,607	0
Accretion on asset retirement obligation		1,051	212
Change in allowance for doubtful accounts		370	315
Amortization of deferred financing costs		2,338	1,072
Amortization of debt discounts		1,054	4,009
Debt extinguishment costs		0	26,429
Non-cash compensation		9,156	27,254
Loss (gain) on disposal of assets	[1]	4,013	(2,598)
Deferred income taxes		0	(78)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable		44,771	3,384
Inventories		6,529	(46)
Prepaid expenses and other current assets		6,242	5,248
Other assets		(333)	532
Accounts payable		(37,495)	18,267
Income tax receivable		1,574	305
Other liabilities		615	4,361
Accrued expenses		1,135	3,853
Net cash provided by operating activities		20,187	74,339
Cash flows from investing activities:
Purchase of Property plant and equipment	[1]	(55,353)	(68,709)
Proceeds from sales of assets	[1]	17,297	17,785
Payments for other long-term assets		(1,260)	0
Net cash used in investing activities		(39,316)	(50,924)
Cash flows from financing activities:
Proceeds from debt		0	332,500
Repayments of debt		(29,364)	(318,929)
Debt extinguishment costs		0	(17,607)
Change in treasury stock including restricted stock issuances		(5,121)	(1,882)
Deferred loan costs and other financing activities		(469)	(13,420)
Net cash used in financing activities		(34,954)	(19,338)
Net (decrease) increase in cash and equivalents		(54,083)	4,077
Cash and cash equivalents - beginning of year		90,300	86,223
Cash and cash equivalents - end of year		36,217	90,300
Supplemental cash flow information:
Capital leases and notes issued for equipment		7,941	20,197
Change in accrued property and equipment		(2,806)	(462)
Income taxes paid		0	0
Change in asset retirement obligations		6,907	(132)
Change in right-of-use assets		14,541
Cash paid for interest		$ 39,248	$ 34,396

[1] (a) See reconciling cash flow items from discontinued operations in Note 2: Discontinued Operations