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Pension and Other Post-Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
—

 
$
—

 
$
31

 
$
44

 
$
—

 
$
—

 
62

 
88

Interest cost
8,968

 
8,646

 
42

 
48

 
17,936

 
17,292

 
84

 
96

Expected return on plan assets
(10,264
)
 
(11,020
)
 
—

 
—

 
(20,528
)
 
(22,040
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(26
)
 
(136
)
 
—

 
—

 
(52
)
 
(272
)
Amortization of net (gain) loss
3,368

 
1,793

 
40

 
73

 
6,736

 
3,586

 
80

 
146

Net periodic benefit cost (gain)
$
2,072

 
$
(581
)
 
$
87

 
$
29

 
$
4,144

 
$
(1,162
)
 
$
174

 
$
58