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Pension and Other Postretirement Employee Benefit Plans - (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans
The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit, or OPEB, plans for the periods presented:
 
Three Months Ended June 30,
(In thousands)
2019
 
2018
 
2019
 
2018
 
Pension Benefit Plans
 
Other Postretirement
Employee  Benefit Plans
Service cost
$
669

 
$
461

 
$
20

 
$
20

Interest cost
3,102

 
3,010

 
752

 
611

Expected return on plan assets
(4,132
)
 
(4,247
)
 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
(419
)
Amortization of actuarial loss (gain)
1,776

 
2,458

 
33

 
(226
)
Net periodic cost (benefit)
$
1,415

 
$
1,682

 
$
805

 
$
(14
)
 
Six Months Ended June 30,
(In thousands)
2019
 
2018
 
2019
 
2018
 
Pension Benefit Plans
 
Other Postretirement
Employee  Benefit Plans
Service cost
$
1,219

 
$
895

 
$
45

 
$
68

Interest cost
6,223

 
6,010

 
1,399

 
1,218

Expected return on plan assets
(8,267
)
 
(8,501
)
 
—

 
—

Amortization of prior service cost (credit)
—

 
—

 
—

 
(838
)
Amortization of actuarial loss (gain)
3,685

 
5,028

 
(195
)
 
(451
)
Net periodic cost (benefit)
$
2,860

 
$
3,432

 
$
1,249

 
$
(3
)