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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2017
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Pension Benefit Costs
The following table details the components of other postretirement benefit costs (credits):
 
Successor
Predecessor
 
Successor
Predecessor
 
Three Months Ended September 30, 2017
Three Months Ended September 30, 2016
 
Nine Months Ended September 30, 2017
Nine Months Ended September 30, 2016
(In thousands)
 
 
 
 
 
Service cost
$
170

$
128

 
$
511

$
393

Interest cost
1,058

951

 
3,175

3,223

Curtailments
(520
)

 
(520
)
(970
)
Amortization of prior service credits

(2,509
)
 

(7,854
)
Amortization of other actuarial losses (gains)

283

 

(849
)
Net benefit cost (credit)
$
708

$
(1,147
)
 
$
3,166

$
(6,057
)
The following table details the components of pension benefit costs (credits):
 
Successor
Predecessor
 
Successor
Predecessor
 
Three Months Ended September 30, 2017
Three Months Ended September 30, 2016
 
Nine Months Ended September 30, 2017
Nine Months Ended September 30, 2016
(In thousands)
 
 
 
 
 
Interest cost
$
2,736

$
2,803

 
$
8,718

$
9,338

Expected return on plan assets
(3,913
)
(4,641
)
 
(12,909
)
(13,623
)
Pension settlement
(229
)

 
(716
)
454

Amortization of other actuarial losses

2,292

 

3,973

Net benefit cost (credit)
$
(1,406
)
$
454

 
$
(4,907
)
$
142