Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current assets:
Cash and cash equivalents	$ 91,199	$ 80,274	$ 50,727	$ 206,505
Accounts receivable, net of allowance for doubtful accounts of $28,715 and $17,484 at December 31, 2012 and December 31, 2011, respectively	1,027,218	540,602
Deferred income taxes	34,120
Prepaid expenses	93,190	34,037
Inventory and other current assets	214,630	228,309
Total current assets	1,460,357	883,222
Property, plant and equipment, net	3,255,220	1,507,368
Goodwill	2,532,065	581,379	588,000
Notes receivable	44,838	73,568
Investments in Subsidiaries
Equity-method investments		72,472
Intangible and other long-term assets, net	510,406	930,136
Total assets	7,802,886	4,048,145
Current liabilities:
Accounts payable	252,363	178,645
Accrued expenses	346,490	197,574
Income taxes payable	153,212	717
Current maturities of long-term debt	20,000	810
Deferred income taxes		831
Current portion of decommissioning liabilities		14,956
Total current liabilities	772,065	393,533
Deferred income taxes	745,144	297,458
Decommissioning liabilities	93,053	108,220
Long-term debt, net	1,814,500	1,685,087
Intercompany Payables or Receivables
Other long-term liabilities	147,045	110,248
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 - 157,501,635, Outstanding - 157,933,224 at December 31, 2012 Authorized - 125,000,000, Issued and Outstanding, 82,425,443 at December 31, 2011	158	80
Additional paid in capital	2,850,855	447,007
Accumulated other comprehensive loss, net	(19,317)	(26,936)
Retained earnings	1,399,383	1,033,448
Total stockholders' equity	4,231,079	1,453,599	1,280,551	1,178,045
Total liabilities and stockholders' equity	$ 7,802,886	$ 4,048,145