Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 207,781	$ 272,624
Accounts receivable, net of allowance for doubtful accounts of $18,414 and $12,156 at September 30, 2020 and December 31, 2019, respectively	181,666	332,047
Income taxes receivable	4,119	740
Prepaid expenses	42,465	49,132
Inventory and other current assets	108,639	117,629
Assets held for sale	51,748	216,197
Total current assets	596,418	988,369
Property, plant and equipment, net of accumulated depreciation and depletion of$2,184,340 and $2,214,116 at September 30, 2020 and December 31, 2019, respectively	574,588	664,949
Operating lease right-of-use assets	56,198	80,906
Goodwill	137,142	137,695
Notes receivable	71,472	68,092
Restricted cash	80,175	2,764
Intangible and other long-term assets, net of accumulated amortization of $24,675and $23,199 at September 30, 2020 and December 31, 2019, respectively	58,253	50,455
Total assets	1,574,246	1,993,230
Current liabilities:
Accounts payable	60,042	92,966
Accrued expenses	159,395	182,934
Current portion of decommissioning liabilities	3,735	3,649
Liabilities held for sale	5,760	44,938
Total current liabilities	228,932	324,487
Long-term debt, net	1,289,288	1,286,629
Decommissioning liabilities	137,315	132,632
Operating lease liabilities	38,649	62,354
Deferred income taxes	3,599	3,247
Other long-term liabilities	126,199	134,308
Stockholders’ equity (deficit):
Preferred stock of $0.01 par value. Authorized - 5,000,000 shares; none issued
Common stock of $0.001 par value Authorized - 25,000,000, Issued - 15,799,318, Outstanding - 14,826,906 at September 30, 2020 Authorized - 25,000,000, Issued - 15,689,463, Outstanding - 14,717,051 at December 31, 2019	16	16
Additional paid-in capital	2,756,031	2,752,859
Treasury stock at cost, 972,412 shares at September 30, 2020 and December 31, 2019, respectively	(4,290)	(4,290)
Accumulated other comprehensive loss, net	(72,534)	(71,927)
Accumulated deficit	(2,928,959)	(2,627,085)
Total stockholders’ equity (deficit)	(249,736)	49,573
Total liabilities and stockholders’ equity (deficit)	$ 1,574,246	$ 1,993,230