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COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Changes in Environmental Liability
Changes in the environmental liability for the last three years are as follows:
(in thousands)
 
Balances at
the Beginning
of the Period
 
Additions
to
Accrual
 
Expenditures
for
Remediation
 
Balance at
Period-end
Year ended December 31, 2017
 
$
12,770

 
$
—

 
$
7,791

 
$
4,979

Year ended December 31, 2018
 
4,979

 
5,600

 
1,496

 
9,083

Year ended December 31, 2019
 
9,083

 
1,576

 
649

 
10,010