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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
Components of net periodic benefit cost (benefit) included in net income (loss) are as follows:
 
Pension Benefits
 
Other Benefits
 
Three months ended September 30,
Nine months ended September 30,
 
Three months ended September 30,
Nine months ended September 30,
(in thousands)
2020
2019
2020
2019
 
2020
2019
2020
2019
Interest cost
$
8,263

$
10,685

$
24,773

$
32,507

 
$
88

$
139

$
232

$
378

Expected return on plan assets
(15,452
)
(13,901
)
(46,636
)
(41,700
)
 
—

—

—

—

Amortization of prior service cost
44

28

130

83

 
(271
)
(540
)
(813
)
(1,618
)
Recognized net actuarial (gain) loss
—

18

—

1,278

 
—

—

—

—

Benefit plans, net (1)
(7,145
)
(3,170
)
(21,733
)
(7,832
)
 
(183
)
(401
)
(581
)
(1,240
)
Service cost included in COS (2)
212

346

632

646

 
5

4

14

12

Net periodic benefit cost (benefit)
$
(6,933
)
$
(2,824
)
$
(21,101
)
$
(7,186
)
 
$
(178
)
$
(397
)
$
(567
)
$
(1,228
)

(1) 
Benefit plans, net, which is presented separately in the Condensed Consolidated Statements of Operations, is not allocated to the segments.
(2) 
Service cost related to a small group of active participants is presented within cost of operations in the Condensed Consolidated Statement of Operations and is allocated to the B&W Thermal segment.