Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 259,889	$ 158,050
Accounts receivable, net of allowance for doubtful accounts of $14,500 and $12,080 at September 30, 2019 and December 31, 2018, respectively	368,530	447,353
Prepaid expenses	64,760	45,802
Inventory and other current assets	139,840	121,700
Total current assets	833,019	772,905
Property, plant and equipment, net of accumulated depreciation and depletion of $2,620,197 and $2,640,344 at September 30, 2019 and December 31, 2018, respectively	891,540	1,109,126
Operating lease right-of-use assets	96,190
Goodwill	135,922	136,788
Notes receivable	67,042	63,993
Restricted cash	2,753	5,698
Intangible and other long-term assets, net of accumulated amortization of $24,686 and $76,358 at September 30, 2019 and December 31, 2018, respectively	97,285	127,452
Total assets	2,123,751	2,215,962
Current liabilities:
Accounts payable	110,398	139,325
Accrued expenses	220,623	219,180
Income taxes payable	3,842	734
Current portion of decommissioning liabilities	3,621	3,538
Total current liabilities	338,484	362,777
Long-term debt, net	1,285,755	1,282,921
Decommissioning liabilities	131,263	126,558
Operating lease liabilities	76,255
Other long-term liabilities	148,907	152,967
Stockholders' equity:
Preferred stock of $0.01 par value. Authorized - 5,000,000 shares; none issued
Common stock of $0.001 par value, Authorized - 250,000,000, Issued and Outstanding - 156,573,565 at September 30, 2019, Authorized - 250,000,000, Issued and Outstanding - 154,885,418 at December 31, 2018	157	155
Additional paid in capital	2,748,477	2,735,125
Accumulated other comprehensive loss, net	(76,987)	(73,177)
Retained deficit	(2,528,560)	(2,371,364)
Total stockholders' equity	143,087	290,739
Total liabilities and stockholders' equity	$ 2,123,751	$ 2,215,962