Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 9,041		$ 3,277
Accounts receivable	63,385		70,897
Deferred tax asset	9,693		10,715
Other current assets	42,063		7,600
Total Current Assets	124,182		92,489
Property and Equipment:
Property and Equipment	5,863,650		5,714,099
Less - Accumulated depreciation, depletion, and amortization	(3,326,908)		(3,125,282)
Property and Equipment, Net	2,536,742		2,588,817
Other Long-Term Assets	14,235		17,199
Total Assets	2,675,159		2,698,505
Current Liabilities:
Accounts payable and accrued liabilities	100,493		82,318
Accrued capital costs	48,498		61,164
Accrued interest	12,986		21,561
Undistributed oil and gas revenues	13,089		10,990
Total Current Liabilities	175,066		176,033
Long-Term Debt	1,079,269	[1]	1,142,368	[1]
Deferred Tax Liabilities	253,689		241,205
Asset Retirement Obligation	67,155		63,225
Other Long-Term Liabilities	9,631		10,324
Commitments and Contingencies	0		0
Stockholders' Equity:
Preferred stock, $0.01 par value	0		0
Common stock, $0.01 par value	443		439
Additional paid-in capital	769,663		762,242
Treasury stock held, at cost	(9,744)		(12,575)
Retained earnings	329,987		315,244
Total Stockholders' Equity	1,090,349	[2]	1,065,350
Total Liabilities and Stockholders' Equity	$ 2,675,159		$ 2,698,505

[1] Amounts are shown net of any debt discount or premium

[2] Unaudited