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U.K. Pension Plan (Tables)
 9 Months Ended
Sep. 30, 2018
Defined Benefit Plan [Abstract]  
Schedule of Net Benefit Costs
The following tables summarize the components of the Pension Program related to the net benefit costs recognized in labor and benefits and other income/(loss), net in the Company's consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017 (dollars in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Operating expense:
 
 
 
 
 
 
 
 
Service cost(a)
$
3,610

 
$
3,909

 
$
11,235

 
$
11,434

Nonoperating income, net:
 
 
 
 
 
 
 
 
Interest cost
2,383

 
2,588

 
7,416

 
7,569

 
Expected return on plan assets
(4,572
)
 
(4,327
)
 
(14,231
)
 
(12,655
)
 
Total nonoperating income, net(b)
(2,189
)
 
(1,739
)
 
(6,815
)
 
(5,086
)
Net periodic benefit cost
$
1,421

 
$
2,170

 
$
4,420

 
$
6,348

(a) Included in labor and benefits within the Company’s consolidated statement of operations.
(b) Included in other income/(loss), net within the Company’s consolidated statement of operations.