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Pension and Other Postretirement Benefit Plans
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefit Plans
Pension and Other Postretirement Benefit Plans
The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:
 
 
Three Months Ended March 31,
 
 
2014
 
2013
 
 
(In thousands)
Defined Benefit Pension Plans
 
 
 
 
Service cost
 
$
250

 
$
325

Interest cost
 
1,312

 
1,167

Expected return on plan assets
 
(2,078
)
 
(1,948
)
Amortization of unrecognized net loss
 
569

 
946

Net periodic benefit cost
 
$
53

 
$
490

Postretirement Benefit Plan
 
 
 
 
Service cost
 
$
5

 
$
—

Interest cost
 
35

 
75

Amortization of prior service cost
 
32

 
—

Amortization of unrecognized net gain
 
(26
)
 
—

Net periodic benefit cost
 
$
46

 
$
75


The Corporation’s pension plan does not have a contribution requirement in 2014. The Corporation made a $15.0 million contribution to the pension plan during the three months ended March 31, 2013. The discount rate used to compute the Corporation's pension plan expense for 2014 is 5.00%.
401(k) Savings Plan expense for the Corporation’s match of participants’ base compensation contributions and a 4% of eligible pay contribution to certain employees who are not grandfathered under the pension plan was $0.8 million and $0.9 million for the three months ended March 31, 2014 and 2013, respectively.