Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets, Current [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 6,698	$ 70,834
Restricted cash	98	98
Oil and gas revenue receivable	93,702	95,142
Oil and Gas Joint Interest Billing Receivables, Current	62,337	48,561
Derivative Assets, Current	93,922	133,991
Inventory, Net	2,883	2,760
Prepaid drilling costs and other current assets	7,787	9,663
Assets, Current	267,427	361,049
Oil And Gas Properties Net Using Full Cost Method Of Accounting [Abstract]
Proved	3,106,966	2,589,423
Unproved properties not being amortized	524,307	486,247
Property, Plant and Equipment, Net	168,376	149,104
Derivative Assets, Noncurrent	10,785	2,066
Other Assets, Noncurrent	7,257	7,726
Assets	4,085,118	3,595,615
Liabilities, Current [Abstract]
Accounts payable and accrued liabilities	236,582	210,311
Current portion of long term debt	154,000	0
Production taxes payable	61,758	53,382
Interest Payable	29,806	26,878
Taxes Payable, Current	26,980	42,685
Derivative Liabilities, Current	0	718
Capital cost accrual	111,200	84,042
Liabilities, Current	620,326	418,016
Long-term Debt, Excluding Current Maturities	1,560,000	1,560,000
Deferred Tax Liabilities, Noncurrent	526,992	420,711
Derivative Liabilities, Noncurrent	1,583	5,337
Other Liabilities, Noncurrent	59,369	52,575
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	452,356	426,779
Treasury Stock, Value	(379)
Retained Earnings (Accumulated Deficit)	864,871	712,197
Stockholders' Equity Attributable to Parent	1,316,848	1,138,976
Liabilities and Stockholders' Equity	$ 4,085,118	$ 3,595,615

Carrying value as of the balance sheet date of obligations incurred and payable pertaining to goods and services received from vendors; and for costs that are statutory in nature, are incurred in connection with contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent, salaries and benefits, and utilities.

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Carrying value as of the balance sheet date of liabilities incurred through that date and payable to the State of Wyoming for oil and gas severance taxes, as well as advalorem taxes payable to Sublette County, Wyoming.

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