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RESTRUCTURING RESERVES - Schedule of Cumulative Amounts Incurred to Date and Expected (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date $ 201,122
Additional amount expected 16,638
Segments | United States  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 62,398
Additional amount expected 5,075
Segments | Canada  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 58,468
Additional amount expected 11,428
Segments | Other businesses  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 60,716
Additional amount expected 135
Unallocated expense  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 19,540
Additional amount expected $ 0