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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2016
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
 
Three Months Ended
 
March 31,
 
March 31,
 
2016
 
2015
 
2016
 
2015
Service cost — benefits earned during the period
$
137

 
$
44

 
$
1

 
$
2

Interest cost on projected benefit obligation
1,355

 
596

 
97

 
93

Expected return on assets
(1,519
)
 
(955
)
 
—

 
—

Amortization of net loss (gain)
464

 
139

 
(19
)
 
(24
)
Net (income) expense
$
437

 
$
(176
)
 
$
79

 
$
71