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Pension and Other Post-Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The Company's net periodic benefit costs for its defined benefit pension plans and post-retirement healthcare plans for both continuing and discontinued operations are as follows (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
Pension Plans
Post-Retirement Healthcare Plan
 
Pension Plans
 
Post-Retirement Healthcare Plan
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
—

 
$
—

 
$
44

 
$
60

 
$
—

 
$
—

 
$
132

 
$
180

Interest cost
8,646

 
9,879

 
48

 
71

 
25,938

 
29,637

 
144

 
213

Expected return on plan assets
(11,020
)
 
(11,528
)
 
—

 
—

 
(33,060
)
 
(34,584
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(136
)
 
(872
)
 
—

 
—

 
(408
)
 
(2,616
)
Amortization of net (gain) loss
1,793

 
(1
)
 
73

 
80

 
5,379

 
(2
)
 
219

 
240

Net periodic benefit cost (gain)
$
(581
)
 
$
(1,650
)
 
$
29

 
$
(661
)
 
$
(1,743
)
 
$
(4,949
)
 
$
87

 
$
(1,983
)