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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]  
Summary of Supplemental Cash Flow Information
 
Years Ended December 31,
(In thousands)
2012
 
2011
 
2010
Net cash paid for:
 
 
 
 
 
Income taxes
$
178

 
$
43,505

 
—

Interest, net of capitalized interest
$
8,942

 
$
273

 
—

Non-cash financing activities and investing activities:
 
 
 
 
 
Change in accrued capital expenditures
$
52,189

 
$
112,606

 
$
5,510

Conversion of debt securities to equity securities
$
9,400

 
—

 
—

Acquisition of exploration rights
$
8,000

 
$
—

 
—

Debt assumed from business acquisitions
$
40,691

 
$
3,184

 
—

Issuance of common stock for business acquisitions
$
284,100

 
$
72,700

 
—

Fixed assets additions under capital lease
$
15,658

 
—

 
—