Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 177,772	$ 187,591
Accounts receivable, net of allowance for doubtful accounts of $27,993 and $29,740 at June 30, 2017 and December 31, 2016, respectively	396,814	297,164
Income taxes receivable	1,888	101,578
Prepaid expenses	42,926	37,288
Inventory and other current assets	141,292	130,772
Assets held for sale	27,322	27,158
Total current assets	788,014	781,551
Property, plant and equipment, net of accumulated depreciation and depletion of $2,638,890 and $2,454,339 at June 30, 2017 and December 31, 2016, respectively	1,455,276	1,605,365
Goodwill	806,191	803,917
Notes receivable	58,317	56,650
Intangible and other long-term assets, net of accumulated amortization of $76,736 and $69,588 at June 30, 2017 and December 31, 2016, respectively	178,132	222,772
Total assets	3,285,930	3,470,255
Current liabilities:
Accounts payable	133,354	94,831
Accrued expenses	218,123	218,192
Income taxes payable		694
Current portion of decommissioning liabilities	22,212	22,164
Liabilities held for sale	6,883	8,653
Total current liabilities	380,572	344,534
Deferred income taxes	182,289	243,611
Decommissioning liabilities	104,891	101,513
Long-term debt, net	1,287,156	1,284,600
Other long-term liabilities	167,553	192,077
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 - 153,077,982 at June 30, 2017, Authorized-250,000,000, Issued and Outstanding - 151,861,661 at December 31, 2016	153	152
Additional Paid in Capital	2,698,820	2,691,553
Accumulated other comprehensive loss, net	(72,502)	(80,248)
Retained deficit	(1,463,002)	(1,307,537)
Total stockholders' equity	1,163,469	1,303,920
Total liabilities and stockholders' equity	$ 3,285,930	$ 3,470,255