Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 500,262	$ 393,046
Accounts receivable, net of allowance for doubtful accounts of $22,748 and $22,076 at June 30, 2015 and December 31, 2014, respectively	570,528	926,768
Deferred Tax Assets, Net, Current	26,387	32,138
Prepaid expenses	62,107	74,750
Inventory and other current assets	192,930	185,429
Assets of Disposal Group, Including Discontinued Operation, Current	131,582	116,680
Total current assets	1,483,796	1,728,811
Property, plant and equipment, net of accumulated depreciation and depletion of $2,245,051 and $2,269,542 at June 30, 2015 and December 31, 2014, respectively	2,461,629	2,733,839
Goodwill	1,892,377	2,468,409
Notes receivable	26,811	25,970
Intangible and other long-term assets, net of accumulated amortization of $80,486 and $81,386 at June 30, 2015 and December 31, 2014, respectively	350,974	420,360
Total assets	6,215,587	7,377,389
Current liabilities:
Accounts payable	134,681	225,306
Accrued expenses	305,622	363,747
Income taxes payable	7,501	40,213
Current maturities of long-term debt	26,279	20,941
Total current liabilities	484,815	712,047
Disposal Group, Including Discontinued Operation, Liabilities	10,732	61,840
Deferred income taxes	559,516	702,996
Decommissioning liabilities	93,076	88,000
Long-term debt, net	1,618,686	1,627,842
Other long-term liabilities	$ 173,922	$ 166,766
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 - 150,749,697 as of June 30, 2015 Authorized - 250,000,000, Issued - 149,648,826, Outstanding, 149,708,825 at December 31, 2014	$ 151	$ 150
Additional Paid in Capital	2,647,272	2,620,328
Accumulated other comprehensive loss, net	(36,725)	(36,280)
Retained earnings	674,874	1,495,540
Total stockholders' equity	3,285,572	4,079,738
Total liabilities and stockholders' equity	$ 6,215,587	$ 7,377,389