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Pension and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2015
Compensation And Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit Cost

The following table provides the components of net periodic benefit costs associated with our pension and other postretirement benefit plans for the three months ended March 31, 2015 and 2014 (in thousands):

 

 

 

Three Months Ended March 31,

 

 

 

2015

 

 

2014

 

Pension and Other Postretirement Benefits:

 

 

 

Interest cost

 

$

4,750

 

 

$

4,902

 

Expected return on plan assets

 

 

(5,300

)

 

 

(6,025

)

Amortization of prior service credit

 

 

(358

)

 

 

(358

)

Amortization of actuarial loss, net

 

 

1,725

 

 

 

1,167

 

Net periodic cost (credit)

 

$

817

 

 

$

(314

)