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BUSINESS COMBINATIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Summary of Allocation of Purchase Price
The components and preliminary allocation of the purchase price consist of the following amounts (in thousands):
 
At Acquisition Dates As Reported
December 31, 2016

 
Measurement Period Adjustments
 
Final Allocation
Accounts receivable
$
15,767

 
$
475

 
$
16,242

Inventories and supplies
12,515

 
173

 
12,688

Prepaid expenses and other current assets
777

 
(25
)
 
752

Property, plant and equipment
143,025

 
891

 
143,916

Permits and other intangibles
28,856

 
—

 
28,856

Current liabilities
(20,258
)
 
353

 
(19,905
)
Closure and post-closure liabilities, less current portion

(2,408
)
 
(596
)
 
(3,004
)
Remedial liabilities, less current portion
(2,041
)
 
(504
)
 
(2,545
)
Deferred taxes, unrecognized tax benefits and other long-term liabilities
(17,019
)
 
(3,200
)
 
(20,219
)
Total identifiable net assets
159,214

 
(2,433
)
 
156,781

Goodwill
45,791

 
2,186

 
47,977

Total purchase price, net of cash acquired
$
205,005

 
$
(247
)
 
$
204,758

The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of April 11, 2015. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed. The Company finalized the purchase accounting for the acquisition of TFI in the second quarter of 2016.
 
Preliminary Allocations as reported at December 31, 2015
 
Measurement Period Adjustments
 
Final Allocations
Accounts Receivable
$
7,585

 
$
(284
)
 
$
7,301

Inventories and supplies
1,791

 
—

 
1,791

Prepaid expenses and other current assets
665

 
—

 
665

Property, plant and equipment
28,862

 
(1,221
)
 
27,641

Permits and other intangibles
18,100

 
—

 
18,100

Current liabilities
(5,845
)
 
(39
)
 
(5,884
)
Closure and post-closure liabilities
(1,676
)
 
(657
)
 
(2,333
)
Deferred taxes, unrecognized tax benefits and other long-term liabilities
(10,030
)
 
856

 
(9,174
)
Total identifiable net assets
39,452

 
(1,345
)
 
38,107

Goodwill
39,134

 
2,095

 
41,229

Total
$
78,586

 
$
750

 
$
79,336