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U.K. Pension Plan (Tables)
 6 Months Ended
Jun. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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 in the Company's consolidated statements of operations for the three and six months ended June 30, 2017 and 2016 (amounts in thousands):
 
Three Months Ended June 30,
 
2017
 
2016
 
GBP
 
USD
 
GBP
 
USD
Service cost
£
2,988

 
$
3,823

 
£
2,395

 
$
3,436

Interest cost
1,978

 
2,531

 
2,227

 
3,197

Expected return on plan assets
(3,307
)
 
(4,232
)
 
(2,847
)
 
(4,085
)
Net periodic benefit cost
£
1,659

 
$
2,122

 
£
1,775

 
$
2,548


 
Six Months Ended June 30,
 
2017
 
2016
 
GBP
 
USD
 
GBP
 
USD
Service cost
£
5,976

 
$
7,526

 
£
4,790

 
$
6,863

Interest cost
3,956

 
4,982

 
4,504

 
6,385

Expected return on plan assets
(6,614
)
 
(8,329
)
 
(5,694
)
 
(8,159
)
Net periodic benefit cost
£
3,318

 
$
4,179

 
£
3,600

 
$
5,089