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U.K. Pension Plan (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017 (amounts in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Operating expense:
 
 
 
 
 
 
 
 
Service cost(a)
$
3,770

 
$
3,823

 
$
7,625

 
$
7,526

Nonoperating income, net:
 
 
 
 
 
 
 
 
Interest cost
2,488

 
2,531

 
5,033

 
4,982

 
Expected return on plan assets
(4,775
)
 
(4,232
)
 
(9,659
)
 
(8,329
)
 
Total nonoperating income, net(b)
(2,287
)
 
(1,701
)
 
(4,626
)
 
(3,347
)
Net periodic benefit cost
$
1,483

 
$
2,122

 
$
2,999

 
$
4,179

(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