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Other Comprehensive Income and Accumulated Other Comprehensive Income
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Other Comprehensive Income and Accumulated Other Comprehensive Income
Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income
The following information presents the Company’s Other comprehensive income (loss), both before and after-tax impacts, within the Condensed Consolidated Statements of Comprehensive Income, which also impact Accumulated other comprehensive income (“AOCI”) in the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Equity.
Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)
Three Months Ended June 30, 2020Three Months Ended June 30, 2019
(Thousands of dollars)
Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Amortization of prior service cost$289  $(69) $220  $318  $(76) $242  
Amortization of net actuarial (gain)/loss9,457  (2,270) 7,187  5,844  (1,403) 4,441  
Regulatory adjustment(8,395) 2,015  (6,380) (5,348) 1,284  (4,064) 
Pension plans other comprehensive income (loss)1,351  (324) 1,027  814  (195) 619  
FSIRS (designated hedging activities):
Amounts reclassified into net income836  (201) 635  836  (200) 636  
FSIRS other comprehensive income (loss)836  (201) 635  836  (200) 636  
Total other comprehensive income (loss) - Southwest Gas Corporation2,187  (525) 1,662  1,650  (395) 1,255  
Foreign currency translation adjustments:
Translation adjustments1,794  —  1,794  787  —  787  
Foreign currency other comprehensive income (loss)1,794  —  1,794  787  —  787  
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.$3,981  $(525) $3,456  $2,437  $(395) $2,042  
Six Months Ended June 30, 2020Six Months Ended June 30, 2019
Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Amortization of prior service cost$578  $(138) $440  $635  $(152) $483  
Amortization of net actuarial (gain)/loss18,915  (4,540) 14,375  11,688  (2,805) 8,883  
Regulatory adjustment(16,790) 4,030  (12,760) (10,695) 2,567  (8,128) 
Pension plans other comprehensive income (loss)2,703  (648) 2,055  1,628  (390) 1,238  
FSIRS (designated hedging activities):
Amounts reclassified into net income1,673  (402) 1,271  1,672  (401) 1,271  
FSIRS other comprehensive income (loss)1,673  (402) 1,271  1,672  (401) 1,271  
Total other comprehensive income (loss) - Southwest Gas Corporation4,376  (1,050) 3,326  3,300  (791) 2,509  
Foreign currency translation adjustments:
Translation adjustments(2,211) —  (2,211) 1,578  —  1,578  
Foreign currency other comprehensive income (loss)(2,211) —  (2,211) 1,578  —  1,578  
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.$2,165  $(1,050) $1,115  $4,878  $(791) $4,087  
 Twelve Months Ended June 30, 2020Twelve Months Ended June 30, 2019
(Thousands of dollars)
Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Net actuarial gain/(loss)$(71,087) $17,061  $(54,026) $(20,426) $4,902  $(15,524) 
Amortization of prior service cost1,214  (291) 923  1,302  (312) 990  
Amortization of net actuarial (gain)/loss30,603  (7,345) 23,258  28,497  (6,839) 21,658  
Prior service cost(1,878) 452  (1,426) —  —  —  
Regulatory adjustment30,849  (7,404) 23,445  (3,809) 914  (2,895) 
Pension plans other comprehensive income (loss)(10,299) 2,473  (7,826) 5,564  (1,335) 4,229  
FSIRS (designated hedging activities):
Amounts reclassified into net income 3,345  (804) 2,541  3,344  (803) 2,541  
FSIRS other comprehensive income (loss)3,345  (804) 2,541  3,344  (803) 2,541  
Total other comprehensive income (loss) - Southwest Gas Corporation(6,954) 1,669  (5,285) 8,908  (2,138) 6,770  
Foreign currency translation adjustments:
Translation adjustments(1,751) —  (1,751) 169  —  169  
Foreign currency other comprehensive income (loss)(1,751) —  (1,751) 169  —  169  
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.
$(8,705) $1,669  $(7,036) $9,077  $(2,138) $6,939  
(1)Tax amounts are calculated using a 24% rate. The Company has elected to indefinitely reinvest the earnings of Centuri’s Canadian subsidiaries in Canada, thus precluding deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments reported in Other comprehensive income (loss).
Approximately $2 million of realized losses (net of tax) related to Southwest’s forward-starting interest rate swaps (“FSIRS”), included in AOCI at June 30, 2020, will be reclassified into interest expense within the next 12 months as the related interest payments on long-term debt occur.
The following table represents a rollforward of AOCI, presented on the Company’s Condensed Consolidated Balance Sheets and its Condensed Consolidated Statements of Equity:
 Defined Benefit PlansFSIRSForeign Currency Items 
(Thousands of dollars)
Before-TaxTax
(Expense)
Benefit (4)		After-TaxBefore-TaxTax
(Expense)
Benefit (4)		After-TaxBefore-TaxTax
(Expense)
Benefit		After-TaxAOCI
Beginning Balance AOCI December 31, 2019
$(66,601) $15,985  $(50,616) $(5,966) $1,431  $(4,535) $(1,581) $—  $(1,581) $(56,732) 
Translation adjustments—  —  —  —  —  —  (2,211) —  (2,211) (2,211) 
Other comprehensive income (loss) before reclassifications
—  —  —  —  —  —  (2,211) —  (2,211) (2,211) 
FSIRS amounts reclassified from AOCI (1)
—  —  —  1,673  (402) 1,271  —  —  —  1,271  
Amortization of prior service cost (2)
578  (138) 440  —  —  —  —  —  —  440  
Amortization of net actuarial loss (2)
18,915  (4,540) 14,375  —  —  —  —  —  —  14,375  
Regulatory adjustment (3)(16,790) 4,030  (12,760) —  —  —  —  —  —  (12,760) 
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.
2,703  (648) 2,055  1,673  (402) 1,271  (2,211) —  (2,211) 1,115  
Ending Balance AOCI June 30, 2020
$(63,898) $15,337  $(48,561) $(4,293) $1,029  $(3,264) $(3,792) $—  $(3,792) $(55,617) 
(1)The FSIRS reclassification amounts are included in Net interest deductions on the Company’s Condensed Consolidated Statements of Income.
(2)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).
(3)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Condensed Consolidated Balance Sheets).
(4)Tax amounts are calculated using a 24% rate.
The following table represents a rollforward of AOCI, presented on Southwest’s Condensed Consolidated Balance Sheets:
 Defined Benefit PlansFSIRS 
(Thousands of dollars)Before-TaxTax
(Expense)
Benefit (8)		After-TaxBefore-TaxTax
(Expense)
Benefit (8)		After-TaxAOCI
Beginning Balance AOCI December 31, 2019
$(66,601) $15,985  $(50,616) $(5,966) $1,431  $(4,535) $(55,151) 
FSIRS amounts reclassified from AOCI (5)—  —  —  1,673  (402) 1,271  1,271  
Amortization of prior service cost (6)578  (138) 440  —  —  —  440  
Amortization of net actuarial loss (6)18,915  (4,540) 14,375  —  —  —  14,375  
Regulatory adjustment (7)(16,790) 4,030  (12,760) —  —  —  (12,760) 
Net current period other comprehensive income attributable to Southwest Gas Corporation
2,703  (648) 2,055  1,673  (402) 1,271  3,326  
Ending Balance AOCI June 30, 2020
$(63,898) $15,337  $(48,561) $(4,293) $1,029  $(3,264) $(51,825) 
(5) The FSIRS reclassification amounts are included in Net interest deductions on Southwest’s Condensed Consolidated Statements of Income.
(6)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).
(7)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Condensed Consolidated Balance Sheets).
(8)Tax amounts are calculated using a 24% rate.
The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:
(Thousands of dollars)
June 30, 2020December 31, 2019
Net actuarial (loss) gain$(464,159) $(483,074) 
Prior service cost(3,063) (3,641) 
Less: amount recognized in regulatory assets403,324  420,114  
Recognized in AOCI$(63,898) $(66,601)