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Nature of Operations and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Goodwill
(Thousands of dollars)
Natural Gas
Operations
 
Infrastructure
Services
 
Consolidated
December 31, 2017
$
10,095

 
$
169,219

 
$
179,314

Additional goodwill from Neuco acquisition
—

 
182

 
182

Foreign currency translation adjustment
—

 
(3,437
)
 
(3,437
)
September 30, 2018
$
10,095

 
$
165,964

 
$
176,059
Accounts Receivable for Services
 
September 30, 2018
 
December 31, 2017
Centuri accounts receivable for services provided to Southwest
$
13,566

 
$
12,987
Schedule of Other Property and Investments
Other Property and Investments. Other property and investments on the Condensed Consolidated Balance Sheets includes (thousands of dollars):
 
September 30, 2018
 
December 31, 2017
Southwest Gas Corporation:
 
 
 
Net cash surrender value of COLI policies
$
123,476

 
$
117,341

Other property
1,728

 
1,773

Total Southwest Gas Corporation
125,204

 
119,114

Centuri property, equipment, and intangibles
613,365

 
554,730

Centuri accumulated depreciation/amortization
(287,396
)
 
(258,906
)
Other property
15,327

 
13,242

Total Southwest Gas Holdings, Inc.
$
466,500

 
$
428,180
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 (thousands of dollars):
 
Three Months Ended
 
Nine Months Ended
 
Twelve Months Ended
 
September 30,
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Southwest Gas Corporation - natural gas operations segment:
 
 
 
 
 
 
 
 
 
 
 
Change in COLI policies
$
4,700

 
$
2,100

 
$
6,000

 
$
6,800

 
$
9,500

 
$
8,800

Interest income
1,506

 
670

 
4,301

 
1,848

 
5,237

 
2,417

Equity AFUDC
448

 
968

 
1,034

 
2,077

 
1,253

 
2,473

Other components of net periodic benefit cost
(5,265
)
 
(4,856
)
 
(15,794
)
 
(14,568
)
 
(20,650
)
 
(19,508
)
Miscellaneous income and (expense)
(553
)
 
(657
)
 
(1,402
)
 
(1,981
)
 
(1,765
)
 
(3,382
)
Southwest Gas Corporation - total other income (deductions)
836

 
(1,775
)
 
(5,861
)
 
(5,824
)
 
(6,425
)
 
(9,200
)
Infrastructure services segment:
 
 
 
 
 
 
 
 
 
 
 
Interest income
4

 
1

 
6

 
2

 
7

 
2

Foreign transaction gain (loss)
(91
)
 
(442
)
 
258

 
(640
)
 
144

 
(640
)
Miscellaneous income and (expense)
125

 
231

 
(595
)
 
676

 
(175
)
 
1,825

Centuri - total other income (deductions)
38

 
(210
)
 
(331
)
 
38

 
(24
)
 
1,187

Corporate and administrative
15

 
5

 
41

 
6

 
48

 
6

Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)
$
889

 
$
(1,980
)
 
$
(6,151
)
 
$
(5,780
)
 
$
(6,401
)
 
$
(8,007
)