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BUSINESS COMBINATIONS (Tables)
 6 Months Ended
Jun. 30, 2018
Business Combinations [Abstract]  
Schedule of Business Acquisitions, by Acquisition
The components and preliminary allocation of the purchase price consist of the following amounts (in thousands):
 
At Acquisition Date
 
Measurement Period Adjustments
 
At Acquisition Date As Reported June 30, 2018
Accounts receivable, including unbilled receivables
$
40,773

 
$
(2,691
)
 
$
38,082

Inventories and supplies
1,442

 
(316
)
 
1,126

Prepaid expenses and other current assets
1,005

 
(80
)
 
925

Property, plant and equipment
72,244

 
—

 
72,244

Permits and other intangibles
5,140

 
—

 
5,140

Current liabilities
(15,908
)
 
(2,631
)
 
(18,539
)
Closure and post-closure liabilities
(604
)
 
—

 
(604
)
Total identifiable net assets
104,092

 
(5,718
)
 
98,374

Goodwill
15,908

 
5,718

 
21,626

Total purchase price
$
120,000

 
$
—

 
$
120,000