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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 2015 and 2014 (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Pension and Other Postretirement Benefits:
 
 
 
 
 
 
 
Interest cost
$
4,799

 
$
4,900

 
$
9,549

 
$
9,802

Expected return on plan assets
(5,259
)
 
(6,025
)
 
(10,559
)
 
(12,050
)
Amortization of prior service credit
(359
)
 
(358
)
 
(717
)
 
(716
)
Amortization of actuarial loss, net
1,798

 
1,167

 
3,523

 
2,334

Net periodic cost (credit)
$
979

 
$
(316
)
 
$
1,796

 
$
(630
)