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Pension Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of pension expense for HNH's and API's pension plans:
 
Three Months Ended March 31,
 
2017
 
2016
Service cost
$
—

 
$
14

Interest cost
5,453

 
6,083

Expected return on plan assets
(6,482
)
 
(7,514
)
Administrative costs
313

 
268

Amortization of actuarial loss
2,288

 
2,125

Total
$
1,572

 
$
976