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Background, Organization, and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Other Property and Investments
Other Property and Investments. Other property and investments on the Condensed Consolidated Balance Sheets includes:
(Thousands of dollars)
March 31, 2020
 
December 31, 2019
Southwest Gas Corporation:
 
 
 
Net cash surrender value of COLI policies
$
116,615

 
$
132,072

Other property
1,932

 
1,715

Total Southwest Gas Corporation
118,547

 
133,787

Centuri property, equipment, and intangibles
1,009,351

 
983,905

Centuri accumulated provision for depreciation and amortization
(363,074
)
 
(352,333
)
Other property
20,698

 
18,814

Total Southwest Gas Holdings, Inc.
$
785,522

 
$
784,173
Schedule of Goodwill
(Thousands of dollars)
 
Natural Gas
Operations
 
Utility Infrastructure
Services
 
Total Company
December 31, 2019
 
$
10,095

 
$
332,928

 
$
343,023

Foreign currency translation adjustment
 
—

 
(9,080
)
 
(9,080
)
March 31, 2020
 
$
10,095

 
$
323,848

 
$
333,943
Other Income (Deductions)
Other Income (Deductions). The following table provides the composition of significant items included in Other income (deductions) in the Condensed Consolidated Statements of Income:
 
Three Months ended March 31,
 
Twelve Months Ended March 31,
(Thousands of dollars)
2020
 
2019
 
2020
 
2019
Southwest Gas Corporation - natural gas operations segment:
 
 
 
 
 
 
 
Change in COLI policies
$
(15,500
)
 
$
7,600

 
$
(5,700
)
 
$
5,100

Interest income
1,388

 
1,597

 
6,147

 
6,199

Equity AFUDC
1,061

 
960

 
4,262

 
4,358

Other components of net periodic benefit cost
(5,005
)
 
(3,765
)
 
(16,299
)
 
(19,560
)
Miscellaneous income and (expense)
(2,480
)
 
(446
)
 
(5,375
)
 
(2,788
)
Southwest Gas Corporation - total other income (deductions)
(20,536
)
 
5,946

 
(16,965
)
 
(6,691
)
Utility infrastructure services segment:
 
 
 
 
 
 
 
Interest income
—

 
—

 
—

 
87

Foreign transaction gain (loss)
(10
)
 
531

 
5

 
162

Miscellaneous income and (expense)
(232
)
 
344

 
(656
)
 
125

Centuri - total other income (deductions)
(242
)
 
875

 
(651
)
 
374

Corporate and administrative
8

 
18

 
92

 
64

Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)
$
(20,770
)
 
$
6,839

 
$
(17,524
)
 
$
(6,253
)
Summary of Redeemable Noncontrolling Interest The following depicts the change to the balance of the redeemable noncontrolling interest:
(Thousands of dollars):
Redeemable Noncontrolling Interest
Balance, December 31, 2019
$
84,542

Net income attributable to redeemable noncontrolling interest
463

Balance, March 31, 2020
$
85,005
Schedule of Earnings Per Share, Basic and Diluted A reconciliation of the denominator used in the Basic and Diluted EPS calculations is shown in the following table:
 
 
Three Months Ended
March 31,
 
Twelve Months Ended
March 31,
(In thousands)
 
2020
 
2019
 
2020
 
2019
Average basic shares
 
55,310

 
53,369

 
54,726

 
50,640

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Management Incentive Plan shares
 
—

 
11

 
9

 
22

Restricted stock units (1)
 
53

 
44

 
57

 
39

Average diluted shares
 
55,363

 
53,424

 
54,792

 
50,701

(1) The number of securities granted included 50,000 and 40,000 performance shares during the three months ending March 31, 2020 and 2019 and 48,000 and 29,000 performance shares during the twelve months ending March 31, 2020 and 2019, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.