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Defined Benefit Plans
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [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,
 
2017
 
2016
 
2017
 
2016
Expected return on plan assets, net of expenses
$
(2,779
)
 
$
(2,890
)
 
$
(8,338
)
 
$
(8,669
)
Interest cost on projected benefit obligation
1,547

 
1,732

 
4,642

 
5,230

Net amortization and deferral
1,357

 
1,585

 
4,072

 
4,691

SERP settlement costs
—

 
—

 
—

 
187

Net periodic expense (benefit)
$
125

 
$
427

 
$
376

 
$
1,439


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, 2017. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2017.