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Defined Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2018
 
2017
 
2018
 
2017
Expected return on plan assets, net of expenses
$
(2,979
)
 
$
(2,780
)
 
$
(5,958
)
 
$
(5,559
)
Interest cost on projected benefit obligation
1,474

 
1,548

 
2,949

 
3,095

Net amortization and deferral
1,251

 
1,358

 
2,501

 
2,715

Net periodic expense (benefit)
$
(254
)
 
$
126

 
$
(508
)
 
$
251