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Defined Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Cost (Benefit)
The components of the combined net periodic expense (benefit) for our defined benefit pension plans were as follows:
 
Three Months Ended 
 March 31,
 
2015
 
2014
Expected return on plan assets, net of expenses
$
(2,983
)
 
$
(3,129
)
Interest cost on projected benefit obligation
2,052

 
2,001

Net amortization and deferral
1,749

 
672

Net periodic expense (benefit)
$
818

 
$
(456
)