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U.K. Pension Plan (Tables)
 9 Months Ended
Sep. 30, 2017
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 in the Company's consolidated statements of operations for the three and nine months ended September 30, 2017 and 2016 (amounts in thousands):
 
Three Months Ended September 30,
 
2017
 
2016
 
GBP
 
USD
 
GBP
 
USD
Service cost
£
2,988

 
$
3,909

 
£
2,394

 
$
3,143

Interest cost
1,978

 
2,588

 
2,227

 
2,923

Expected return on plan assets
(3,307
)
 
(4,327
)
 
(2,846
)
 
(3,737
)
Net periodic benefit cost
£
1,659

 
$
2,170

 
£
1,775

 
$
2,329


 
Nine Months Ended September 30,
 
2017
 
2016
 
GBP
 
USD
 
GBP
 
USD
Service cost
£
8,964

 
$
11,434

 
£
7,182

 
$
10,006

Interest cost
5,934

 
7,569

 
6,681

 
9,308

Expected return on plan assets
(9,921
)
 
(12,655
)
 
(8,538
)
 
(11,896
)
Net periodic benefit cost
£
4,977

 
$
6,348

 
£
5,325

 
$
7,418