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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Defined Benefit Plan [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following tables provide the components of net periodic benefit costs for the three- and nine-month periods ended September 30, 2019 and 2018.
 
 
 
 
Select
 
 
 
 
Employees'
 
Executive
 
Postretirement
 
 
Pension
 
Retirement
 
Benefit
 
 
Plan
 
Plan
 
Plans
Net Periodic Benefit Cost
 
 
 
 
 
 
For the Three Months Ended September 30, 2019:
 
 
 
 
 
 
Service Cost 1
 
$
382

 
$
81

 
$
30

Interest Cost 2
 
513

 
54

 
91

Expected Return on Plan Assets 2
 
(765
)
 
—

 
—

Amortization of Prior Service Cost 2
 
17

 
14

 
25

Amortization of Net Loss 2
 
153

 
29

 
(10
)
Net Periodic Cost
 
$
300

 
$
178

 
$
136

 
 
 
 
 
 
 
Plan Contributions During the Period
 
$
—

 
$
117

 
$
51

 
 
 
 
 
 
 
For the Three Months Ended September 30, 2018:
 
 
 
 
 
 
Service Cost 1
 
$
389

 
$
104

 
$
34

Interest Cost 2
 
400

 
48

 
81

Expected Return on Plan Assets 2
 
(841
)
 
—

 
—

Amortization of Prior Service (Credit) Cost 2
 
(12
)
 
14

 
25

Amortization of Net Loss 2
 
48

 
33

 
—

Net Periodic (Benefit) Cost
 
$
(16
)
 
$
199

 
$
140

 
 
 
 
 
 
 
Plan Contributions During the Period
 
$
—

 
$
116

 
$
56

 
 
 
 
 
 
 
Net Periodic Benefit Cost
 
 
 
 
 
 
For the Nine Months Ended September 30, 2019:
 
 
 
 
 
 
Service Cost 1
 
$
1,146

 
$
243

 
$
91

Interest Cost 2
 
1,253

 
162

 
273

Expected Return on Plan Assets 2
 
(2,296
)
 
—

 
—

Amortization of Prior Service (Credit) Cost 2
 
52

 
41

 
76

Amortization of Net Loss 2
 
460

 
86

 
(32
)
Net Periodic (Benefit) Cost
 
$
615

 
$
532

 
$
408

 
 
 
 
 
 
 
Plan Contributions During the Period
 
$
—

 
$
350

 
$
142

 
 
 
 
 
 
 
Estimated Future Contributions in the Current Fiscal Year
 
$
—

 
$
—

 
$
—

 
 
 
 
 
 
 
For the Nine Months Ended September 30, 2018:
 
 
 
 
 
 
Service Cost 1
 
$
1,168

 
$
311

 
$
102

Interest Cost 2
 
1,199

 
152

 
248

Expected Return on Plan Assets 2
 
(2,522
)
 
—

 
—

Amortization of Prior Service (Credit) Cost 2
 
(37
)
 
43

 
75

Amortization of Net Loss 2
 
145

 
99

 
—

Net Periodic (Benefit) Cost
 
$
(47
)
 
$
605

 
$
425

 
 
 
 
 
 
 
Plan Contributions During the Period
 
$
—

 
$
349

 
$
175

 
 
 
 
 
 
 

Footnotes:
1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income
2. Included in Other Operating Expense on the Consolidated Statements of Income