Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 320,042	$ 196,047
Accounts receivable, net of allowance for doubtful accounts of $27,366 and $31,030 at September 30, 2014 and December 31, 2013, respectively	967,943	937,195
Deferred Tax Assets, Net, Current	27,024	8,785
Income tax receivable		5,532
Prepaid expenses	72,072	70,421
Inventory and other current assets	185,613	258,449
Assets Held-for-sale, Current	285,759
Total current assets	1,858,453	1,476,429
Property, plant and equipment, net of accumulated depreciation and depletion of $2,159,166 and $1,827,011 at September 30, 2014 and December 31, 2013, respectively	2,702,532	3,002,194
Goodwill	2,456,522	2,458,109
Notes receivable	25,560	23,708
Intangible and other long-term assets, net of accumulated amortization of $110,115 and $84,567 at September 30, 2014 and December 31, 2013, respectively	420,873	450,867
Total assets	7,463,940	7,411,307
Current liabilities:
Accounts payable	207,242	216,029
Accrued expenses	367,476	376,049
Income taxes payable	37,417
Current portion of decommissioning liabilities		27,322
Current maturities of long-term debt	20,344	20,000
Total current liabilities	709,328	639,400
Liabilities of Assets Held-for-sale	76,849
Deferred income taxes	729,246	736,080
Decommissioning liabilities	87,443	56,197
Long-term debt, net	1,630,834	1,646,535
Other long-term liabilities	165,379	201,651
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 - 153,958,963, Outstanding - 154,019,882 at September 30, 2014 Authorized - 250,000,000, Issued - 158,976,784, Outstanding, 159,158,022 at December 31, 2013	154	159
Additional Paid in Capital	2,724,777	2,873,579
Accumulated other comprehensive loss, net	(25,067)	(17,500)
Retained earnings	1,441,846	1,275,206
Total stockholders' equity	4,141,710	4,131,444
Total liabilities and stockholders' equity	$ 7,463,940	$ 7,411,307