Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 1,650		$ 251,696
Accounts receivable	49,994		64,392
Deferred tax asset	4,864		6,603
Other current assets	5,873		5,460
Total Current Assets	62,381		328,151
Property and Equipment:
Property and Equipment	5,046,268		4,466,845
Less - Accumulated depreciation, depletion, and amortization	(2,781,965)		(2,599,079)
Property and Equipment, Net	2,264,303		1,867,766
Other Long-Term Assets	14,803		16,552
Total Assets	2,341,487		2,212,469
Current Liabilities:
Accounts payable and accrued liabilities	99,606		95,966
Accrued capital costs	82,187		98,844
Accrued interest	12,016		12,459
Undistributed oil and gas revenues	2,722		4,525
Total Current Liabilities	196,531		211,794
Long-Term Debt	822,721	[1]	719,775	[1]
Deferred Tax Liabilities	212,876		206,567
Asset Retirement Obligation	77,204		67,115
Other Long-Term Liabilities	10,795		10,709
Commitments and Contingencies	0		0
Stockholders' Equity:
Preferred stock, $0.01 par value, 5,000,000 shares authorized, none outstanding	0		0
Common stock, $0.01 par value, 150,000,000 shares authorized, 43,398,351 and 42,969,546 shares issues, and 42,884,215 and 42,485,075 shares outstanding, respectively	434		430
Additional paid-in capital	743,677		726,956
Treasury stock held, at cost, 514,136 and 484,471 shares, respectively	(13,831)		(12,350)
Retained earnings	291,193		281,473
Accumulated other comprehensive income (loss), net of tax	(113)		0
Total Stockholders' Equity	1,021,360		996,509
Total Liabilities and Stockholders' Equity	$ 2,341,487		$ 2,212,469

[1] Amounts are shown net of debt discount