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Lease Commitments - Components of Lease Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | $ 7,545 | $ 7,725 | $ 22,938 | $ 24,051
Amounts capitalized | (825) | (949) | (2,599) | (2,964)
Total operating lease expense | 6,720 | 6,776 | 20,339 | 21,087
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 893 | 274 | 2,187 | 556
Interest on lease liabilities | 134 | 54 | 358 | 117
Amounts capitalized | (733) | (195) | (1,787) | (391)
Total financing lease expense | 294 | 133 | 758 | 282
Variable lease expense | 63 | 32 | 158 | 64
Short-term lease expense | 22 | 68 | 183 | 263
Total lease expense for the period | 7,099 | 7,009 | 21,438 | 21,696
PNM |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | 6,798 | 6,873 | 20,538 | 21,260
Amounts capitalized | (248) | (319) | (786) | (1,015)
Total operating lease expense | 6,550 | 6,554 | 19,752 | 20,245
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 435 | 143 | 1,022 | 286
Interest on lease liabilities | 58 | 26 | 156 | 56
Amounts capitalized | (281) | (81) | (682) | (158)
Total financing lease expense | 212 | 88 | 496 | 184
Variable lease expense | 63 | 32 | 158 | 64
Short-term lease expense | 16 | 63 | 176 | 212
Total lease expense for the period | 6,841 | 6,737 | 20,582 | 20,705
TNMP |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | 685 | 726 | 2,205 | 2,439
Amounts capitalized | (577) | (630) | (1,812) | (1,949)
Total operating lease expense | 108 | 96 | 393 | 490
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 439 | 125 | 1,110 | 264
Interest on lease liabilities | 74 | 27 | 198 | 61
Amounts capitalized | (452) | (114) | (1,105) | (233)
Total financing lease expense | 61 | 38 | 203 | 92
Variable lease expense | 0 | 0 | 0 | 0
Short-term lease expense | 4 | 5 | 5 | 10
Total lease expense for the period | $ 173 | $ 139 | $ 601 | $ 592

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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