CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 22	$ 120
Accounts receivable	270,841us-gaap_AccountsReceivableNetCurrent	322,630us-gaap_AccountsReceivableNetCurrent
Derivative asset	380,633us-gaap_DerivativeAssetsCurrent	402,668us-gaap_DerivativeAssetsCurrent
Prepaid expenses and other	18,147	19,625
Total current assets	669,643us-gaap_AssetsCurrent	745,043us-gaap_AssetsCurrent
Proved Oil and Gas Properties	7,006,832	7,348,436
Less - accumulated depletion, depreciation, and amortization	(2,865,627)	(3,233,012)
Unproved Oil and Gas Properties	512,461	532,498
Wells in progress	459,806sm_WellsInProgress	503,734sm_WellsInProgress
Oil, gas, and other property and equipment held for sale net of accumulated depletion, depreciation and amortization of $580,637 and $22,482, respectively	184,951	17,891
Other property and equipment, net of accumulated depreciation of $35,590 and $37,079, respectively	344,670	334,356
Total property and equipment, net	5,643,093us-gaap_PropertyPlantAndEquipmentNet	5,503,903us-gaap_PropertyPlantAndEquipmentNet
Derivative asset	204,841us-gaap_DerivativeAssetsNoncurrent	189,540us-gaap_DerivativeAssetsNoncurrent
Other noncurrent assets	83,109us-gaap_OtherAssetsNoncurrent	78,214us-gaap_OtherAssetsNoncurrent
Total other noncurrent assets	287,950us-gaap_AssetsNoncurrent	267,754us-gaap_AssetsNoncurrent
Total Assets	6,600,686us-gaap_Assets	6,516,700us-gaap_Assets
Liabilities
Accounts payable and accrued expenses	561,051	640,684
Deferred tax liability	135,204us-gaap_DeferredTaxLiabilitiesCurrent	142,976us-gaap_DeferredTaxLiabilitiesCurrent
Other current liabilities	0us-gaap_OtherLiabilitiesCurrent	1,000us-gaap_OtherLiabilitiesCurrent
Total current liabilities	696,255us-gaap_LiabilitiesCurrent	784,660us-gaap_LiabilitiesCurrent
Revolving credit facility	416,500us-gaap_LineOfCredit	166,000us-gaap_LineOfCredit
Senior Notes (note 5)	2,200,000us-gaap_SeniorNotes	2,200,000us-gaap_SeniorNotes
Asset retirement obligation	108,815	120,429
Asset retirement obligation associated with oil and gas properties held for sale	14,286	438
Net Profits Plan liability	22,802	27,136
Deferred income taxes	865,726	891,681
Derivative liability	398us-gaap_DerivativeLiabilitiesNoncurrent	70us-gaap_DerivativeLiabilitiesNoncurrent
Other noncurrent liabilities	39,676us-gaap_OtherLiabilitiesNoncurrent	39,631us-gaap_OtherLiabilitiesNoncurrent
Total noncurrent liabilities	3,668,203us-gaap_LiabilitiesNoncurrent	3,445,385us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (note 6)
Stockholders' equity:
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued and outstanding; 67,464,185 and 67,463,060, respectively	675us-gaap_CommonStockValue	675us-gaap_CommonStockValue
Additional paid-in-capital	289,294	283,295
Retained earnings	1,957,747	2,013,997
Accumulated other comprehensive loss	(11,488)	(11,312)
Total stockholders' equity	2,236,228	2,286,655
Total Liabilities and Stockholders' Equity	$ 6,600,686	$ 6,516,700

Noncurrent portion of the carrying amount of a liability for an asset retirement obligation for an asset held for sale. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

No definition available.