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Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Ownership percentage	50.00%
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 95,637	$ 97,914	$ 94,606
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	33,493	31,095	28,907
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	367	382	427
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	140	141	66
Services billings: | TNMP to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	154	172
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	183	0	0
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	2,924	0	0
Interconnection and facility study billings: | PNM to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	2,108	0	0
Interconnection and facility study billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	68,820	0	0
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	2,585	21	11
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	136	133	132
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	289	220	150
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	23,391	0
Income tax sharing payments: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	0	0	0
Income tax sharing payments: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	3,424	20,686	0
Income tax sharing payments: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 134	$ 0	$ 0

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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- Definition

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+ References

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