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Pension and Other Post-Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 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

 
$
—

 
$
—

 
$
88

 
$
120

Interest cost
8,646

 
9,879

 
48

 
71

 
17,292

 
19,758

 
96

 
142

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

 
—

 
(22,040
)
 
(23,056
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(136
)
 
(872
)
 
—

 
—

 
(272
)
 
(1,744
)
Amortization of net (gain) loss
1,793

 
—

 
73

 
80

 
3,586

 
(1
)
 
146

 
160

Net periodic benefit cost (gain)
$
(581
)
 
$
(1,649
)
 
$
29

 
$
(661
)
 
$
(1,162
)
 
$
(3,299
)
 
$
58

 
$
(1,322
)