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LEASES (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2017, the approximate future minimum lease payments for operating leases were as follows (in thousands of dollars):
Year
 
Future Minimum Lease Payments
2018
 
$
63,625

2019
 
50,610

2020
 
31,984

2021
 
20,891

2022
 
13,555

Thereafter
 
15,879

Total minimum payments required
 
196,544

Less amounts representing sublease income
 
(4,125
)
 
 
$
192,419