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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Asset Retirement Obligations
A reconciliation of the ARO liabilities is as follows:
 
 
PNMR
 
PNM
 
TNMP
 
(In thousands)
Liability at December 31, 2014
$
104,170

 
$
103,182

 
$
848

Liabilities incurred
—

 
—

 
—

Liabilities settled
(730
)
 
(506
)
 
(224
)
Accretion expense
8,625

 
8,543

 
71

Revisions to estimated cash flows
(170
)
 
(170
)
 
—

Liability at December 31, 2015
111,895

 
111,049

 
695

Liabilities incurred
—

 
—

 
—

Liabilities settled
(14
)
 
(14
)
 
—

Accretion expense
9,170

 
9,098

 
59

Revisions to estimated cash flows
6,468

 
6,468

 
—

Liability at December 31, 2016
127,519

 
126,601

 
754

Liabilities incurred(1)
1,854

 
1,853

 
—

Liabilities settled
(968
)
 
(944
)
 
(24
)
Accretion expense
10,680

 
10,603

 
63

Revisions to estimated cash flows
7,594

 
7,594

 
—

Liability at December 31, 2017
$
146,679

 
$
145,707

 
$
793


(1)  Represents the obligation related to the additional ownership interest in SJGS Unit 4 that PNM acquired on December 31, 2017 due to the restructuring of the ownership of SJGS.