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Defined Benefit Plans
 6 Months Ended
Jun. 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 
 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


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