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Defined Benefit Plans
 9 Months Ended
Sep. 30, 2015
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 were as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
Expected return on plan assets, net of expenses
$
(2,983
)
 
$
(3,129
)
 
$
(8,949
)
 
$
(9,386
)
Interest cost on projected benefit obligation
2,052

 
2,001

 
6,157

 
6,002

Net amortization and deferral
1,748

 
672

 
5,246

 
2,015

Net periodic expense (benefit)
$
817

 
$
(456
)
 
$
2,454

 
$
(1,369
)

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, 2015. We do not expect to make any contributions to the qualified defined benefit plan during the remainder of 2015.