Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 187,591	$ 564,017
Accounts receivable, net of allowance for doubtful accounts of $29,740 and $28,242 at December 31, 2016 and December 31, 2015, respectively	297,164	428,514
Income tax receivable	101,578
Prepaid expenses	37,288	42,298
Inventory and other current assets	130,772	165,062
Assets held for Sale	27,158	95,234
Total current assets	781,551	1,295,125
Property, plant and equipment, net of accumulated depreciation and depletion	1,605,365	2,123,291
Goodwill	803,917	1,140,101
Notes receivable	56,650	52,382
Intangible and other long-term assets, net of accumulated amortization	222,772	303,345
Total assets	3,470,255	4,914,244
Current liabilities:
Accounts payable	94,831	114,475
Accrued expenses	218,192	271,246
Income taxes payable	694	9,185
Current portion of decommissioning liabilities	22,164	19,052
Current maturities of long-term debt		29,957
Liabilities Held-for-sale	8,653	4,661
Total current liabilities	344,534	448,576
Deferred income taxes	243,611	383,069
Decommissioning liabilities	101,513	98,890
Long-term debt, net	1,284,600	1,588,263
Other long-term liabilities	192,077	184,634
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-151,861,661 at December 31, 2016; Authorized-250,000,000, Issued and Outstanding-150,861,500 at December 31, 2015	152	151
Additional paid in capital	2,691,553	2,664,517
Accumulated other comprehensive loss, net	(80,248)	(45,694)
Retained earnings	(1,307,537)	(408,162)
Total stockholders' equity	1,303,920	2,210,812
Total liabilities and stockholders' equity	$ 3,470,255	$ 4,914,244