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	68,615		70,897
Deferred tax asset	4,829		4,974
Other current assets	21,033		7,600
Total Current Assets	95,041		86,748
Property and Equipment:
Property and Equipment	5,923,457		5,714,099
Less - Accumulated depreciation, depletion, and amortization	(3,308,992)		(3,174,453)
Property and Equipment, Net	2,614,465		2,539,646
Other Long-Term Assets	15,030		17,199
Total Assets	2,724,536		2,643,593
Current Liabilities:
Accounts payable and accrued liabilities	104,523		83,361
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		177,076
Long-Term Debt	1,178,301	[1]	1,142,368	[1]
Deferred Tax Liabilities	229,107		217,384
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		761,972
Treasury stock held, at cost	(9,686)		(12,575)
Retained earnings	296,831		283,380
Total Stockholders' Equity	1,054,463		1,033,216
Total Liabilities and Stockholders' Equity	$ 2,724,536		$ 2,643,593

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