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Pension and Other Postretirement Benefit Plans
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Pension and Other Postretirement Benefit Plans
Pension and Other Postretirement Benefit Plans
The components of net periodic benefit cost (income) for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2013
 
2012
 
2013
 
2012
 
 
(In thousands)
Defined Benefit Pension Plans
 
 
 
 
 
 
 
 
Service cost
 
$
325

 
$
303

 
$
650

 
$
606

Interest cost
 
1,167

 
1,215

 
2,334

 
2,430

Expected return on plan assets
 
(1,948
)
 
(1,732
)
 
(3,896
)
 
(3,463
)
Amortization of prior service credit
 
(1
)
 
(1
)
 
(1
)
 
(1
)
Amortization of unrecognized net loss
 
946

 
615

 
1,892

 
1,229

Net periodic benefit cost
 
$
489

 
$
400

 
$
979

 
$
801

Postretirement Benefit Plan
 
 
 
 
 
 
 
 
Service cost
 
$
4

 
$
—

 
$
9

 
$
—

Interest cost
 
36

 
36

 
72

 
73

Amortization of prior service credit
 
153

 
(75
)
 
206

 
(150
)
Amortization of unrecognized net gain
 
(18
)
 
(7
)
 
(37
)
 
(14
)
Net periodic benefit cost (income)
 
$
175

 
$
(46
)
 
$
250

 
$
(91
)

The Corporation’s pension plan does not have a contribution requirement in 2013. The Corporation made a voluntary $15.0 million contribution to the pension plan during the first quarter of 2013 related to the 2012 plan year. The discount rate used to compute the Corporation's pension plan expense for 2013 is 4.08%.
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 $0.9 million and $0.8 million for the three months ended June 30, 2013 and 2012, respectively, and $1.8 million and $1.5 million for the six months ended June 30, 2013 and 2012, respectively.