Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 1,049	$ 18,593
Accounts receivable (less allowance for doubtful accounts of $5,039 and $5,342 at December 31, 2014 and 2013, respectively)	189,812us-gaap_AccountsReceivableNetCurrent	139,788us-gaap_AccountsReceivableNetCurrent
Materials and supplies	5,590	10,998
Current derivative asset (Note 13)	31,139us-gaap_DerivativeAssetsCurrent	515us-gaap_DerivativeAssetsCurrent
Current deferred tax asset (Note 8)	11,527us-gaap_DeferredTaxAssetsNetCurrent	13,585us-gaap_DeferredTaxAssetsNetCurrent
Assets held for sale (Note 3)	0	15,621
Prepaid expenses and other	13,374	12,931
Total current assets	252,491us-gaap_AssetsCurrent	212,031us-gaap_AssetsCurrent
Oil and natural gas properties, on the full cost method:
Proved properties	4,990,753	4,235,712
Unproved properties not being amortized	485,568	545,588
Drilling equipment	1,620,692	1,477,093
Gas gathering and processing equipment	628,689	549,422
Saltwater disposal systems	56,702unt_Saltwaterdisposalsystems	44,579unt_Saltwaterdisposalsystems
Transportation equipment	40,693us-gaap_MachineryAndEquipmentGross	39,666us-gaap_MachineryAndEquipmentGross
Other	57,706us-gaap_PropertyPlantAndEquipmentOther	42,856us-gaap_PropertyPlantAndEquipmentOther
Property, plant and equipment, gross, total	7,880,803us-gaap_PropertyPlantAndEquipmentGross	6,934,916us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion, amortization, and impairment	3,747,412	3,212,225
Net property and equipment	4,133,391us-gaap_PropertyPlantAndEquipmentNet	3,722,691us-gaap_PropertyPlantAndEquipmentNet
Debt issuance cost	10,255us-gaap_DeferredCosts	11,844us-gaap_DeferredCosts
Goodwill (Note 2)	62,808us-gaap_Goodwill	62,808us-gaap_Goodwill
Other assets	14,783us-gaap_OtherAssetsNoncurrent	13,016us-gaap_OtherAssetsNoncurrent
Total assets	4,473,728us-gaap_Assets	4,022,390us-gaap_Assets
Current liabilities:
Accounts payable	218,500us-gaap_AccountsPayableCurrent	154,062us-gaap_AccountsPayableCurrent
Accrued liabilities (Note 5)	70,171us-gaap_AccruedLiabilitiesCurrent	64,363us-gaap_AccruedLiabilitiesCurrent
Income taxes payable	481us-gaap_AccruedIncomeTaxesCurrent	7,474us-gaap_AccruedIncomeTaxesCurrent
Current derivative liabilities (Note 13)	0us-gaap_DerivativeLiabilitiesCurrent	5,561us-gaap_DerivativeLiabilitiesCurrent
Current portion of other long-term liabilities (Note 6)	15,019us-gaap_OtherLiabilitiesCurrent	12,113us-gaap_OtherLiabilitiesCurrent
Total current liabilities	304,171us-gaap_LiabilitiesCurrent	243,573us-gaap_LiabilitiesCurrent
Long-term debt (Note 6)	812,163us-gaap_LongTermDebtNoncurrent	645,696us-gaap_LongTermDebtNoncurrent
Other long-term liabilities (Note 6)	148,785us-gaap_OtherLiabilitiesNoncurrent	158,331us-gaap_OtherLiabilitiesNoncurrent
Deferred income taxes (Note 8)	876,215	801,398
Commitments and contingencies (Note 16)	0us-gaap_CommitmentsAndContingencies	0us-gaap_CommitmentsAndContingencies
Shareholders' equity:
Preferred stock, $1.00 par value, 5,000,000 shares authorized, none issued	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, $0.20 par value, 175,000,000 shares authorized, 49,593,812 and 49,107,004 shares issued as of December 31, 2014 and 2013, respectively	9,732us-gaap_CommonStockValue	9,659us-gaap_CommonStockValue
Capital in excess of par value	468,123us-gaap_AdditionalPaidInCapital	445,470us-gaap_AdditionalPaidInCapital
Retained earnings	1,854,539	1,718,263
Total shareholders' equity	2,332,394us-gaap_StockholdersEquity	2,173,392us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 4,473,728	$ 4,022,390

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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