Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 1,530	$ 1,852
Short-term investments	309,000us-gaap_ShortTermInvestments	0us-gaap_ShortTermInvestments
Accounts receivable, net of allowance for doubtful accounts of $681 and $688 at March 31, 2015 and December 31, 2014, respectively	137,720us-gaap_AccountsReceivableNetCurrent	157,678us-gaap_AccountsReceivableNetCurrent
Inventories	17,763us-gaap_InventoryNet	14,251us-gaap_InventoryNet
Assets held for sale	0	395,797
Derivative instruments	272,675us-gaap_DerivativeInstrumentsAndHedges	322,337us-gaap_DerivativeInstrumentsAndHedges
Prepayments and other	18,009us-gaap_PrepaidExpenseCurrent	27,445us-gaap_PrepaidExpenseCurrent
Total current assets	756,697us-gaap_AssetsCurrent	919,360us-gaap_AssetsCurrent
Oil and natural gas properties, successful efforts method
Proved properties	7,263,661	6,903,514
Unproved properties	164,208	142,340
Less accumulated depreciation, depletion and amortization	2,016,936	1,893,106
Oil and natural gas properties, net	5,410,933	5,152,748
Other property and equipment, net	46,248	46,389
Total property, plant and equipment, net	5,457,181us-gaap_PropertyPlantAndEquipmentNet	5,199,137us-gaap_PropertyPlantAndEquipmentNet
Other assets	14,865us-gaap_DeferredCosts	19,761us-gaap_DeferredCosts
TOTAL ASSETS	6,228,743us-gaap_Assets	6,138,258us-gaap_Assets
Current Liabilities
Accounts payable	97,563us-gaap_AccountsPayableCurrent	101,453us-gaap_AccountsPayableCurrent
Accrued taxes	17,199us-gaap_AccruedIncomeTaxesCurrent	5,530us-gaap_AccruedIncomeTaxesCurrent
Accrued wages and benefits	16,089	21,553
Accrued capital costs	159,026	207,461
Revenue and royalty payable	66,761us-gaap_AccruedRoyaltiesCurrent	72,047us-gaap_AccruedRoyaltiesCurrent
Liabilities related to assets held for sale	0	24,230
Pension liabilities	29,442	24,609
Deferred income taxes	53,867us-gaap_DeferredTaxLiabilitiesCurrent	79,164us-gaap_DeferredTaxLiabilitiesCurrent
Derivative instruments	12,870	988
Other	17,658us-gaap_OtherLiabilitiesCurrent	23,288us-gaap_OtherLiabilitiesCurrent
Total current liabilities	470,475us-gaap_LiabilitiesCurrent	560,323us-gaap_LiabilitiesCurrent
Long-term debt	1,238,569us-gaap_LongTermDebtNoncurrent	1,038,563us-gaap_LongTermDebtNoncurrent
Asset retirement obligations	97,315	94,060
Pension and other postretirement liabilities	534	15,935
Deferred income taxes	1,010,770	1,000,486
Noncurrent derivative instruments	1,018	0
Other long-term liabilities	10,885us-gaap_OtherLiabilitiesNoncurrent	14,287us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	2,829,566us-gaap_Liabilities	2,723,654us-gaap_Liabilities
Commitments and Contingencies
Shareholders’ Equity
Preferred stock, cumulative, $0.01 par value, 5,000,000 shares authorized	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common shareholders’ equity
Common stock, $0.01 par value; 150,000,000 shares authorized; 76,051,599 shares and 75,875,711 shares issued at March 31, 2015 and December 31, 2014, respectively	761us-gaap_CommonStockValue	759us-gaap_CommonStockValue
Premium on capital stock	568,395us-gaap_AdditionalPaidInCapital	564,438us-gaap_AdditionalPaidInCapital
Retained earnings	2,980,939	2,997,821
Accumulated other comprehensive income (loss), net of tax
Pension and postretirement plans	(21,019)	(22,870)
Deferred compensation plan	2,953us-gaap_DeferredCompensationEquity	2,862us-gaap_DeferredCompensationEquity
Treasury stock, at cost; 3,046,233 shares and 2,980,598 shares at March 31, 2015 and December 31, 2014, respectively	(132,852)us-gaap_TreasuryStockValue	(128,406)us-gaap_TreasuryStockValue
Total shareholders’ equity	3,399,177us-gaap_StockholdersEquity	3,414,604us-gaap_StockholdersEquity
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 6,228,743	$ 6,138,258

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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