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Defined Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net Periodic Cost (Benefit)
The components of the combined net periodic expense (benefit) for our defined benefit pension plans are presented in the table below.
 
Three Months Ended 
 March 31,
 
2018
 
2017
Expected return on plan assets, net of expenses
$
(2,979
)
 
$
(2,779
)
Interest cost on projected benefit obligation
1,475

 
1,547

Net amortization and deferral
1,250

 
1,357

Net periodic expense (benefit)
$
(254
)
 
$
125