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Lease Obligations (Tables)
12 Months Ended
Dec. 31, 2017
Lease Obligations  
Schedule of obligations for minimum rentals under non-cancellable operating leases

 

Year Ended December 31,

 

(in thousands)

 

 

 

 

 

2018

 

$

86,300

 

2019

 

70,900

 

2020

 

55,800

 

2021

 

35,500

 

2022

 

22,700

 

Thereafter

 

55,500