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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Employee Benefit Plans
Employee Benefit Plans
Defined Benefit Plan
We sponsor a noncontributory qualified retirement plan. The components of net periodic benefit cost for this plan are as follows (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
324

 
$
305

 
$
657

 
$
648

Interest cost
514

 
531

 
839

 
1,045

Expected return on plan assets
(921
)
 
(804
)
 
(1,413
)
 
(1,563
)
Amortization of net loss
307

 
369

 
578

 
746

Total
$
224

 
$
401

 
$
661

 
$
876


The components of net periodic benefit cost other than the service cost component are included in Interest and Other Income/Expense in the Condensed Consolidated Statements of Operations.
For the six months ended June 30, 2018 and 2017, we contributed $1.0 million and $2.5 million to the qualified retirement plan, respectively. Currently, we do not anticipate making any additional contributions to this plan during 2018.
Defined Contribution Plans
Compensation expense related to our defined contribution plans was $1.0 million and $.9 million for the three months ended June 30, 2018 and 2017, respectively, and $1.9 million and $2.1 million for the six months ended June 30, 2018 and 2017, respectively.