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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2019
Defined Benefit Plan [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit cost for the Defined Benefit Pension Plan were as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
2018
 
2019
2018
Service cost
$
1,345

$
1,709

 
$
2,691

$
3,417

Interest cost
4,344

3,868

 
8,687

7,735

Expected return on plan assets
(6,100
)
(6,185
)
 
(12,200
)
(12,370
)
Prior service cost
7

14

 
13

29

Net loss (gain)
940

2,157

 
1,881

4,315

Net periodic benefit cost
$
536

$
1,563

 
$
1,072

$
3,126



Defined Benefit Postretirement Healthcare Plans

The components of net periodic benefit cost for the Defined Benefit Postretirement Healthcare Plans were as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
2018
 
2019
2018
Service cost
$
454

$
572

 
$
908

$
1,145

Interest cost
563

521

 
1,123

1,042

Expected return on plan assets
(58
)
(56
)
 
(115
)
(113
)
Prior service cost (benefit)
(100
)
(99
)
 
(199
)
(198
)
Net loss (gain)

54

 

108

Net periodic benefit cost
$
859

$
992

 
$
1,717

$
1,984



Supplemental Non-qualified Defined Benefit and Defined Contribution Plans

The components of net periodic benefit cost for the Supplemental Non-qualified Defined Benefit and Defined Contribution Plans were as follows (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
2018
 
2019
2018
Service cost
$
692

$
435

 
$
1,977

$
715

Interest cost
324

292

 
648

585

Prior service cost
1

1

 
1

1

Net loss (gain)
134

250

 
268

500

Net periodic benefit cost
$
1,151

$
978

 
$
2,894

$
1,801



Schedule of Defined Benefit Plans Contributions Contributions made in 2019 and anticipated contributions for 2019 and 2020 are as follows (in thousands):
 
Contributions Made
Contributions Made
Additional Contributions
Contributions
 
Three Months Ended June 30, 2019
Six Months Ended June 30, 2019
Anticipated for 2019
Anticipated for 2020
Defined Benefit Pension Plan
$

$

$
12,700

$
12,700

Non-pension Defined Benefit Postretirement Healthcare Plans
$
1,108

$
2,217

$
2,217

$
4,271

Supplemental Non-qualified Defined Benefit and Defined Contribution Plans
$
366

$
732

$
732

$
1,562