Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 564		$ 3,277
Accounts receivable	69,387		70,897
Deferred tax asset	9,795		10,715
Other current assets	21,032		7,600
Total Current Assets	100,778		92,489
Property and Equipment:
Property and Equipment	5,923,457		5,714,099
Less - Accumulated depreciation, depletion, and amortization	(3,261,672)		(3,125,282)
Property and Equipment, Net	2,661,785		2,588,817
Other Long-Term Assets	15,030		17,199
Total Assets	2,777,593		2,698,505
Current Liabilities:
Accounts payable and accrued liabilities	104,523		82,318
Accrued capital costs	49,870		61,164
Accrued interest	21,505		21,561
Undistributed oil and gas revenues	11,109		10,990
Total Current Liabilities	187,007		176,033
Long-Term Debt	1,178,301	[1]	1,142,368	[1]
Deferred Tax Liabilities	251,482		241,205
Asset Retirement Obligation	65,963		63,225
Other Long-Term Liabilities	9,695		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	766,875		762,242
Treasury stock held, at cost	(9,686)		(12,575)
Retained earnings	327,513		315,244
Total Stockholders' Equity	1,085,145		1,065,350
Total Liabilities and Stockholders' Equity	$ 2,777,593		$ 2,698,505

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