XML 89 R41.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Revenue from Contracts with Customers Disaggregation of oil, gas, and NGL production revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,585,750 | [1] | $ 1,636,357 | [2] | $ 1,253,783 | [3]
Concentration Risk, Percentage | 100.00% | [1] | 100.00% | [2] | 100.00% | [3]
Revenue, Remaining Performance Obligation, Amount | $ 0 |  |  |  |  |
Midland Basin [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,195,736 | [1] | $ 1,064,607 | [2] | $ 482,060 | [3]
South Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 390,014 | [1] | 514,514 | [2] | 610,485 | [3]
Rocky Mountain [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 57,236 | [2] | $ 161,238 | [3]
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Midland Basin [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 75.00% | [1] | 65.00% | [2] | 38.00% | [3]
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | South Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 25.00% | [1] | 32.00% | [2] | 49.00% | [3]
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Rocky Mountain [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 3.00% | [2] | 13.00% | [3]
Oil production revenue [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,183,212 |  | $ 1,065,676 |  | $ 654,250 |
Oil production revenue [Member] | Midland Basin [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,119,786 |  | 938,004 |  | 419,732 |
Oil production revenue [Member] | South Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 63,426 |  | 72,821 |  | 82,674 |
Oil production revenue [Member] | Rocky Mountain [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 54,851 |  | 151,844 |
Gas production revenue [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 262,529 |  | 354,450 |  | 369,410 |
Gas production revenue [Member] | Midland Basin [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 75,827 |  | 125,603 |  | 61,781 |
Gas production revenue [Member] | South Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 186,702 |  | 227,252 |  | 301,780 |
Gas production revenue [Member] | Rocky Mountain [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 1,595 |  | 5,849 |
NGL production revenue [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 140,009 |  | 216,231 |  | 230,123 |
NGL production revenue [Member] | Midland Basin [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 123 |  | 1,000 |  | 547 |
NGL production revenue [Member] | South Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 139,886 |  | 214,441 |  | 226,031 |
NGL production revenue [Member] | Rocky Mountain [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 790 |  | $ 3,545 |
[1] | Note: Amounts may not calculate due to rounding.
[2] | Note: Amounts may not calculate due to rounding.
[3] | Note: Amounts may not calculate due to rounding.

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045 + Details
Name: | us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=sm_MidlandBasinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=sm_SouthTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=sm_RockyMountainMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=sm_OilRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=sm_NaturalGasRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=sm_OilandCondensateRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |