XML 39 R19.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Suspended Well Costs | 12 Months Ended
--- | ---
Dec. 31, 2018
Suspended Well Costs [Abstract] |
Suspended Well Costs [Text Block] | Note 12 – Suspended Well Costs The following table reflects the net changes in capitalized exploratory well costs during 2018, 2017, and 2016. The table does not include amounts that were capitalized and either subsequently expensed or reclassified to producing well costs in the same year:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Beginning balance | $ | 49,446 |  |  | $ | 19,846 |  |  | $ | 11,952 |
Additions to capitalized exploratory well costs pending the determination of proved reserves | 11,197 |  |  | 49,446 |  |  | 19,846 |
Divestitures | (109 | ) |  | — |  |  | — |
Reclassifications to wells, facilities, and equipment based on the determination of proved reserves | (49,337 | ) |  | (19,846 | ) |  | (11,952 | )
Capitalized exploratory well costs charged to expense | — |  |  | — |  |  | — |
Ending balance | $ | 11,197 |  |  | $ | 49,446 |  |  | $ | 19,846 |
As of December 31, 2018, there were no exploratory well costs that were capitalized for more than one year.

X
- Definition Suspended Well Costs [Abstract] + References No definition available. + Details
Name: | sm_SuspendedWellCostsAbstract
Namespace Prefix: | sm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for parts or all of the information related to suspended well costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447 + Details
Name: | us-gaap_SuspendedWellCostsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration