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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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 and nine months ended September 30, 2016 and 2015:
 
 
Three Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
2,283

 
$
2,564

 
$
188

 
$
208

Interest cost
 
3,976

 
3,962

 
176

 
174

Expected return on plan assets
 
(4,877
)
 
(5,278
)
 
(1,222
)
 
(1,248
)
Recognized net actuarial loss (gain)
 
1,464

 
1,372

 
—

 
(44
)
Amortization of prior service cost
 
(172
)
 
(211
)
 
(1,662
)
 
(1,661
)
Net periodic benefit cost (benefit)
 
$
2,674

 
$
2,409

 
$
(2,520
)
 
$
(2,571
)
 
 
Nine Months Ended September 30,
 
 
Pension and Supplemental Executive Retirement Plans
 
Other Postretirement Benefit Plans
(In thousands)
 
2016
 
2015
 
2016
 
2015
Service cost
 
$
6,848

 
$
7,692

 
$
564

 
$
624

Interest cost
 
11,929

 
11,886

 
528

 
523

Expected return on plan assets
 
(14,631
)
 
(15,832
)
 
(3,665
)
 
(3,743
)
Recognized net actuarial loss (gain)
 
4,392

 
4,114

 
—

 
(132
)
Amortization of prior service cost
 
(515
)
 
(633
)
 
(4,987
)
 
(4,986
)
Net periodic benefit cost (benefit)
 
$
8,023

 
$
7,227

 
$
(7,560
)
 
$
(7,714
)