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Defined Benefit Plans
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Defined Benefit Plans
Defined Benefit Plans
The components of the combined net periodic expense (benefit) for our defined benefit pension plans are presented in the table below.
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2018
 
2017
 
2018
 
2017
Expected return on plan assets, net of expenses
$
(2,979
)
 
$
(2,779
)
 
$
(8,937
)
 
$
(8,338
)
Interest cost on projected benefit obligation
1,475

 
1,547

 
4,424

 
4,642

Net amortization and deferral
1,250

 
1,357

 
3,751

 
4,072

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

 
$
(762
)
 
$
376


Our non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the nine months ended September 30, 2018. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2018.