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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The following tables provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for three and six months ended June 30, 2017 and 2016:
 
 
Three Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
2,484

 
$
2,402

 
$
220

 
$
201

Interest cost
 
3,879

 
4,024

 
186

 
180

Expected return on plan assets
 
(5,013
)
 
(4,865
)
 
(1,312
)
 
(1,221
)
Recognized net actuarial loss
 
1,549

 
1,567

 
—

 
—

Amortization of prior service cost
 
(106
)
 
(171
)
 
(1,663
)
 
(1,663
)
Net periodic benefit cost (benefit)
 
$
2,793

 
$
2,957

 
$
(2,569
)
 
$
(2,503
)
 
 
Six Months Ended June 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
4,778

 
$
4,565

 
$
407

 
$
376

Interest cost
 
7,737

 
7,953

 
353

 
352

Expected return on plan assets
 
(10,049
)
 
(9,754
)
 
(2,624
)
 
(2,443
)
Recognized net actuarial loss
 
3,084

 
2,928

 
—

 
—

Amortization of prior service cost
 
(213
)
 
(343
)
 
(3,325
)
 
(3,325
)
Net periodic benefit cost (benefit)
 
$
5,337

 
$
5,349

 
$
(5,189
)
 
$
(5,040
)