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LEASES (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
At December 31, 2016, the approximate future minimum lease payments for all operating leases were as follows (in thousands of dollars):
Year
 
Future Minimum Lease Payments
2017
 
$
59,045

2018
 
45,504

2019
 
32,616

2020
 
15,358

2021
 
10,333

Thereafter
 
15,469

Total minimum payments required
 
178,325

Less amounts representing sublease income
 
(4,063
)
 
 
$
174,262