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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Loss Contingencies
The following table details the amounts accrued and expended for environmental remediation at December 31 (in thousands):
 
 
2016
 
2015
Beginning of Year
$
123,194

 
$
124,308

Accruals
61,933

 
18,747

Expenditures
(32,080
)
 
(19,861
)
End of Year
$
153,047

 
$
123,194