Other Comprehensive Income and Accumulated Other Comprehensive Income ("AOCI") (Tables)

12 Months Ended

Dec. 31, 2018



(Thousands of dollars)	2018									2017									2016
	Before- Tax Amount			Tax (Expense) or Benefit (1)			Net-of- Tax Amount			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)	$	(20,426	)	$	4,902		$	(15,524	)	$	(43,027	)	$	10,326		$	(32,701	)	$	(22,770	)	$	8,652		$	(14,118	)
Amortization of prior service cost	1,335			(320		)	1,015			1,335			(507		)	828			1,335			(507		)	828
Amortization of net actuarial (gain)/loss	33,617			(8,068		)	25,549			25,445			(9,669		)	15,776			27,066			(10,285		)	16,781
Regulatory adjustment	(8,233		)	1,976			(6,257		)	12,340			250			12,590			(5,584		)	2,122			(3,462		)
Pension plans other comprehensive income (loss)	6,293			(1,510		)	4,783			(3,907		)	400			(3,507		)	47			(18		)	29
FSIRS (designated hedging activities):
Amounts reclassified into net income	3,345			(804		)	2,541			3,344			(1,271		)	2,073			3,345			(1,270		)	2,075
FSIRS other comprehensive income (loss)	3,345			(804		)	2,541			3,344			(1,271		)	2,073			3,345			(1,270		)	2,075
Total other comprehensive income (loss) – Southwest Gas Corporation	9,638			(2,314		)	7,324			(563		)	(871		)	(1,434		)	3,392			(1,288		)	2,104
Foreign currency translation adjustments:
Translation adjustments	(3,010		)	—			(3,010		)	1,771			—			1,771			161			—			161
Foreign currency other comprehensive income (loss)	(3,010		)	—			(3,010		)	1,771			—			1,771			161			—			161
Total other comprehensive income (loss) – Southwest Gas Holdings, Inc.	$	6,628		$	(2,314	)	$	4,314		$	1,208		$	(871	)	$	337		$	3,553		$	(1,288	)	$	2,265

(1) Tax amounts are calculated using a 24% rate following the December 22, 2017 enactment date of the TCJA. For periods prior to the enactment date, tax amounts were calculated using a 38% rate. At December 31, 2017, excess taxes related to pre-tax amounts which accumulated in AOCI prior to tax reform were required to remain in the account until the first quarter of 2018, when ASU 2018-02 was adopted, permitting previously stranded amounts to be released from AOCI and applied to Retained earnings (see table for Accumulated other comprehensive income (loss), including the balance, below). With regard to foreign currency translation adjustments, the Company has elected to indefinitely reinvest the earnings of Centuri’s Canadian subsidiaries in Canada, thus preventing deferred taxes on such earnings. As a result of this assertion, the Company is not recognizing any tax effect or presenting a tax expense or benefit for the currency translation adjustment amount reported in Other comprehensive income (loss), as repatriation of earnings is not anticipated.

Schedule of Estimated Amounts Amortized from Accumulated Other Comprehensive Income or Regulatory Assets into Net Periodic Benefit Cost

The estimated amounts that will be amortized from accumulated other comprehensive income or regulatory assets into net periodic benefit cost over the next year are summarized below (in thousands):



Retirement plan net actuarial loss	$	22,000
SERP net actuarial loss	1,000
PBOP prior service cost	1,300

Rollforward of Accumulated Other Comprehensive Income

The following table represents a rollforward of AOCI, presented on Southwest’s Consolidated Balance Sheets:

AOCI—Rollforward

(Thousands of dollars)



	Defined Benefit Plans									FSIRS
	Before-Tax			Tax (Expense) Benefit (10)			After- Tax			Before- Tax			Tax (Expense) Benefit (10)			After- Tax			Other			AOCI
Beginning Balance AOCI December 31, 2017	$	(61,520	)	$	22,293		$	(39,227	)	$	(12,655	)	$	4,809		$	(7,846	)	$	—		$	(47,073	)
Net actuarial gain/(loss)	(20,426		)	4,902			(15,524		)	—			—			—			—			(15,524		)
Other comprehensive income before reclassifications	(20,426		)	4,902			(15,524		)	—			—			—			—			(15,524		)
FSIRS amounts reclassified from AOCI (6)	—			—			—			3,345			(804		)	2,541			—			2,541
Amortization of prior service cost (7)	1,335			(320		)	1,015			—			—			—			—			1,015
Amortization of net actuarial loss (7)	33,617			(8,068		)	25,549			—			—			—			—			25,549
Regulatory adjustment (8)	(8,233		)	1,976			(6,257		)	—			—			—			—			(6,257		)
Net current period other comprehensive income (loss) attributable to Southwest Gas Corporation	6,293			(1,510		)	4,783			3,345			(804		)	2,541			—			7,324
Reclassification of excess deferred taxes (9)	—			—			—			—			—			—			(9,300		)	(9,300		)
Ending Balance AOCI December 31, 2018	$	(55,227	)	$	20,783		$	(34,444	)	$	(9,310	)	$	4,005		$	(5,305	)	$	(9,300	)	$	(49,049	)


(6)	The FSIRS reclassification amounts are included in the Net interest deductions line item on the Consolidated Statements of Income.


(7)	These AOCI components are included in the computation of net periodic benefit cost (see Note 11 - Pension and Other Postretirement Benefits for additional details).


(8)	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 the Deferred charges and other assets line item on the Consolidated Balance Sheets).


(9)	Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02 during the first quarter of 2018, which permitted such release.


(10)	Tax amounts related to the before-tax balances are calculated using a 24% effective rate after the release of previously stranded excess deferred taxes existing as a result of the TCJA; amounts prior to the December 22, 2017 enactment of the TCJA were calculated using a 38% effective rate.

The following table represents a rollforward of AOCI, presented on the Company’s Consolidated Balance Sheets and its Consolidated Statements of Equity:

AOCI—Rollforward

(Thousands of dollars)



	Defined Benefit Plans									FSIRS									Foreign Currency Items
	Before-Tax			Tax (Expense) Benefit (5)			After-Tax			Before- Tax			Tax (Expense) Benefit (5)			After-Tax			Before- Tax			Tax (Expense) Benefit		After-Tax			Other			AOCI
Beginning Balance AOCI December 31, 2017	$	(61,520	)	$	22,293		$	(39,227	)	$	(12,655	)	$	4,809		$	(7,846	)	$	(609	)	$	—	$	(609	)	$	—		$	(47,682	)
Net actuarial gain/(loss)	(20,426		)	4,902			(15,524		)	—			—			—			—			—		—			—			(15,524		)
Translation adjustments	—			—			—			—			—			—			(3,010		)	—		(3,010		)	—			(3,010		)
Other comprehensive income before reclassifications	(20,426		)	4,902			(15,524		)	—			—			—			(3,010		)	—		(3,010		)	—			(18,534		)
FSIRS amounts reclassified from AOCI (1)	—			—			—			3,345			(804		)	2,541			—			—		—			—			2,541
Amortization of prior service cost (2)	1,335			(320		)	1,015			—			—			—			—			—		—			—			1,015
Amortization of net actuarial loss (2)	33,617			(8,068		)	25,549			—			—			—			—			—		—			—			25,549
Regulatory adjustment (3)	(8,233		)	1,976			(6,257		)	—			—			—			—			—		—			—			(6,257		)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	6,293			(1,510		)	4,783			3,345			(804		)	2,541			(3,010		)	—		(3,010		)	—			4,314
Reclassification of excess deferred taxes (4)	—			—			—			—			—			—			—			—		—			(9,300		)	(9,300		)
Ending Balance AOCI December 31, 2018	$	(55,227	)	$	20,783		$	(34,444	)	$	(9,310	)	$	4,005		$	(5,305	)	$	(3,619	)	$	—	$	(3,619	)	$	(9,300	)	$	(52,668	)


(1)	The FSIRS reclassification amounts are included in the Net interest deductions line item on the Consolidated Statements of Income.


(2)	These AOCI components are included in the computation of net periodic benefit cost (see Note 11 - Pension and Other Postretirement Benefits 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 the Deferred charges and other assets line item on the Consolidated Balance Sheets).


(4)	Release of excess deferred taxes accumulated prior to December 22, 2017 (date of enactment of the TCJA), as a result of the adoption of ASU 2018-02 during the first quarter of 2018, which permitted such release.


(5)	Tax amounts related to the before-tax balance are calculated using a 24% effective rate after the release of previously stranded excess deferred taxes existing as a result of the TCJA; amounts prior to the December 22, 2017 enactment of the TCJA were calculated using a 38% effective rate.

Amount Recognized Before Income Tax in Accumulated Other Comprehensive Income

The following table represents amounts (before income tax impacts) included in Accumulated other comprehensive income (in the table above), that have not yet been recognized in net periodic benefit cost as of December 31, 2018 and 2017:

Amounts Recognized in AOCI (Before Tax)

(Thousands of dollars)



	2018			2017
Net actuarial (loss) gain	$	(435,364	)	$	(448,555	)
Prior service cost	(3,033		)	(4,368		)
Less: amount recognized in regulatory assets	383,170			391,403
Recognized in AOCI	$	(55,227	)	$	(61,520	)

Other Changes in Plan Assets and Benefit Obligations Recognized in Net Periodic Benefit Cost and Other Comprehensive Income



	2018												2017												2016
	Total			Qualified Retirement Plan			SERP			PBOP			Total			Qualified Retirement Plan			SERP			PBOP			Total			Qualified Retirement Plan			SERP			PBOP
(Thousands of dollars)
Net actuarial loss (gain) (a)	$	20,426		$	23,607		$	(3,940	)	$	759		$	43,027		$	44,149		$	3,334		$	(4,456	)	$	22,770		$	25,153		$	1,347		$	(3,730	)
Amortization of prior service cost (b)	(1,335		)	—			—			(1,335		)	(1,335		)	—			—			(1,335		)	(1,335		)	—			—			(1,335		)
Amortization of net actuarial loss (b)	(33,617		)	(32,115		)	(1,502		)	—			(25,445		)	(24,004		)	(1,441		)	—			(27,066		)	(25,266		)	(1,383		)	(417		)
Regulatory adjustment	8,233			7,657			—			576			(12,340		)	(18,131		)	—			5,791			5,584			102			—			5,482
Recognized in other comprehensive (income) loss	(6,293		)	(851		)	(5,442		)	—			3,907			2,014			1,893			—			(47		)	(11		)	(36		)	—
Net periodic benefit costs recognized in net income	51,332			46,089			3,405			1,838			44,593			38,283			3,633			2,677			44,423			37,568			3,573			3,282
Total of amount recognized in net periodic benefit cost and other comprehensive (income) loss	$	45,039		$	45,238		$	(2,037	)	$	1,838		$	48,500		$	40,297		$	5,526		$	2,677		$	44,376		$	37,557		$	3,537		$	3,282