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Lease Commitments - Components of Lease Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | $ 7,658 | $ 7,692 | $ 15,393 | $ 16,312
Amounts capitalized | (849) | (1,006) | (1,774) | (2,015)
Total operating lease expense | 6,809 | 6,686 | 13,619 | 14,297
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 741 | 158 | 1,294 | 282
Interest on lease liabilities | 121 | 31 | 224 | 64
Amounts capitalized | (594) | (79) | (1,053) | (157)
Total financing lease expense | 268 | 110 | 465 | 189
Variable lease expense | 63 | 32 | 95 | 32
Short-term lease expense | 75 | 101 | 161 | 195
Total lease expense for the period | 7,215 | 6,929 | 14,340 | 14,713
PNM |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | 6,847 | 6,803 | 13,740 | 14,386
Amounts capitalized | (247) | (344) | (538) | (696)
Total operating lease expense | 6,600 | 6,459 | 13,202 | 13,690
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 341 | 77 | 588 | 143
Interest on lease liabilities | 52 | 14 | 97 | 30
Amounts capitalized | (226) | (41) | (401) | (82)
Total financing lease expense | 167 | 50 | 284 | 91
Variable lease expense | 63 | 32 | 95 | 32
Short-term lease expense | 75 | 75 | 160 | 149
Total lease expense for the period | 6,905 | 6,616 | 13,741 | 13,962
TNMP |  |  |  |
Lease, Cost [Line Items] |  |  |  |
Operating lease cost: | 746 | 815 | 1,521 | 1,713
Amounts capitalized | (602) | (662) | (1,237) | (1,319)
Total operating lease expense | 144 | 153 | 284 | 394
Financing lease cost: |  |  |  |
Amortization of right-of-use assets | 382 | 81 | 672 | 139
Interest on lease liabilities | 68 | 17 | 124 | 34
Amounts capitalized | (369) | (38) | (653) | (75)
Total financing lease expense | 81 | 60 | 143 | 98
Variable lease expense | 0 | 0 | 0 | 0
Short-term lease expense | 1 | 2 | 1 | 5
Total lease expense for the period | $ 226 | $ 215 | $ 428 | $ 497

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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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