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LONG-TERM DEBT (Tables)
 12 Months Ended
Dec. 31, 2017
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following (in thousands of dollars):
 
As of December 31,
 
2017
 
2016
4.60% senior notes due 2045
$
1,000,000

 
$
1,000,000

3.75% senior notes due 2046
400,000

 
400,000

4.20% senior notes due 2047
400,000

 
—

British pound term loan
194,574

 
187,506

Euro term loan
131,956

 
120,900

Canadian dollar revolving credit facility
99,388

 
100,521

Capital lease obligations and other
84,274

 
71,109

 
2,310,192

 
1,880,036

Less current maturities
(38,709
)
 
(19,966
)
Debt issuance costs and discounts
(23,447
)
 
(19,124
)
 
$
2,248,036

 
$
1,840,946
Schedule of Maturities of Long-term Debt
The scheduled aggregate principal payments related to capital lease obligations and long-term debt, excluding debt issuance costs, are due as follows (in thousands of dollars):
Year
 
Payment Amount

2018
 
$
38,709

2019
 
144,156

2020
 
190,774

2021
 
136,543

2022
 
10

Thereafter
 
1,800,000

Total
 
$
2,310,192