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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations [Text Block]
QEP records asset retirement obligations (ARO) associated with the retirement of tangible, long-lived assets. The Company's ARO liability applies primarily to abandonment costs associated with oil and gas wells and certain other properties. The fair values of such costs are estimated by Company personnel based on abandonment costs of similar assets and depreciated over the life of the related assets. Revisions to the ARO estimates result from changes in expected cash flows or material changes in estimated asset retirement costs. The ARO liability is adjusted to present value each period through an accretion calculation using a credit-adjusted risk-free interest rate. Of the $160.5 million and $214.1 million ARO liability for the periods ended September 30, 2018 and December 31, 2017, respectively, $5.0 million and $3.5 million, respectively, were included as a current liability within "Asset retirement obligations" on the Condensed Consolidated Balance Sheets.

The following is a reconciliation of the changes in the Company's ARO for the period specified below:
 
Asset Retirement Obligations
 
(in millions)
ARO liability at December 31, 2017(1)
$
214.1

Accretion
5.0

Additions
3.2

Revisions
(3.4
)
Liabilities related to assets sold(2)
(51.7
)
Liabilities settled
(6.7
)
ARO liability at September 30, 2018
$
160.5


_______________________
(1) 
Includes $51.6 million of ARO classified as "Other long-term liabilities held for sale" on the Condensed Consolidated Balance Sheets as of December 31, 2017 related to the Uinta Basin Divestiture.
(2) 
Liabilities related to assets sold during the nine months ended September 30, 2018, includes $51.0 million related to the Uinta Basin Divestiture (refer to Note 3 – Acquisitions and Divestitures for more information).