Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 559,238	$ 564,017
Accounts receivable, net of allowance for doubtful accounts of $32,055 and $28,242 at March 31, 2016 and December 31, 2015, respectively	356,842	428,514
Prepaid expenses	49,291	42,298
Inventory and other current assets	154,503	165,062
Assets of Disposal Group, Including Discontinued Operation, Current	66,713	95,234
Total current assets	1,186,587	1,295,125
Property, plant and equipment, net of accumulated depreciation and depletion of $2,343,681 and $2,278,856 at March 31, 2016 and December 31, 2015, respectively	2,065,528	2,123,291
Goodwill	1,139,625	1,140,101
Notes receivable	53,325	52,382
Intangible and other long-term assets, net of accumulated amortization of $87,429 and $83,520 at March 31, 2016 and December 31, 2015, respectively	301,033	303,345
Total assets	4,746,098	4,914,244
Current liabilities:
Accounts payable	95,912	114,475
Accrued expenses	275,381	271,246
Income taxes payable	17,856	9,185
Current portion of decommissioning liabilities	22,625	19,052
Current maturities of long-term debt	6,028	29,957
Total current liabilities	421,297	448,576
Disposal Group, Including Discontinued Operation, Liabilities	3,495	4,661
Deferred income taxes	332,694	383,069
Decommissioning liabilities	97,011	98,890
Long-term debt, net	1,608,575	1,588,263
Other long-term liabilities	$ 179,499	$ 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 - 151,412,233 as of March 31, 2016 Authorized - 250,000,000, Issued and Outstanding - 150,861,500 at December 31, 2015	$ 151	$ 151
Additional Paid in Capital	2,664,761	2,664,517
Accumulated other comprehensive loss, net	(50,449)	(45,694)
Retained earnings	(507,441)	(408,162)
Total stockholders' equity	2,107,022	2,210,812
Total liabilities and stockholders' equity	$ 4,746,098	$ 4,914,244