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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
EMPLOYEE BENEFIT PLANS

The following table summarizes key information related to the Company's pension plans and other postretirement benefits:

 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended
 
Nine Months Ended
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost — benefits earned during the period
$
133

 
$
131

 
$
398

 
$
392

 
$
2

 
$
2

 
$
6

 
$
7

Interest cost on projected benefit obligation
1,205

 
1,549

 
3,803

 
4,647

 
93

 
108

 
278

 
323

Expected return on assets
(1,814
)
 
(2,130
)
 
(5,627
)
 
(6,389
)
 
—

 
—

 
—

 
—

Settlement loss
—

 
—

 
1,607

 
—

 
—

 
—

 
—

 
—

Amortization of net loss (gain)
254

 
269

 
823

 
806

 
(24
)
 
(15
)
 
(73
)
 
(45
)
Net (income) expense
$
(222
)
 
$
(181
)
 
$
1,004

 
$
(544
)
 
$
71

 
$
95

 
$
211

 
$
285