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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [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 months ended March 31, 2017 and 2016:
 
 
Three Months Ended March 31,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
2,294

 
$
2,163

 
$
187

 
$
175

Interest cost
 
3,858

 
3,929

 
167

 
172

Expected return on plan assets
 
(5,036
)
 
(4,889
)
 
(1,312
)
 
(1,222
)
Recognized net actuarial loss
 
1,535

 
1,361

 
—

 
—

Amortization of prior service cost
 
(107
)
 
(172
)
 
(1,662
)
 
(1,662
)
Net periodic benefit cost (benefit)
 
$
2,544

 
$
2,392

 
$
(2,620
)
 
$
(2,537
)