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RESTRUCTURING - Schedule of Cumulative Amounts Incurred to Date and Expected (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date $ 224,456
Additional amount expected 16,274
Segments | United States [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 63,936
Additional amount expected 5,888
Segments | Canada [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 81,405
Additional amount expected 8,901
Segments | Other Segments [Member]  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 64,263
Additional amount expected 1,485
Unallocated expense  
Restructuring Cost and Reserve [Line Items]  
Cumulative amount incurred to date 14,852
Additional amount expected $ 0