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BUSINESS COMBINATIONS (Tables)
 12 Months Ended
Dec. 31, 2014
Evergreen Oil, Inc.  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
The following table summarizes the recognized amounts of assets acquired and liabilities assumed at September 13, 2013 (in thousands):
 
Preliminary Allocations
 
Measurement Period Adjustments
 
Final Allocations
Inventories and supplies
$
1,089

 
$
—

 
$
1,089

Prepaid and other current assets
1,291

 
(273
)
 
1,018

Property, plant and equipment
40,563

 
—

 
40,563

Permits and other intangibles
17,100

 
—

 
17,100

Deferred tax assets, less current portion
2,368

 
(2,368
)
 
—

Other assets
3,607

 
(239
)
 
3,368

Current liabilities
(6,198
)
 
(552
)
 
(6,750
)
Closure and post-closure liabilities
(659
)
 
—

 
(659
)
Remedial liabilities, less current portion
(2,103
)
 
463

 
(1,640
)
Other long-term liabilities
(1,139
)
 
(920
)
 
(2,059
)
Total identifiable net assets
55,919

 
(3,889
)
 
52,030

Goodwill
—

 
4,288

 
4,288

Total
$
55,919

 
$
399

 
$
56,318
Safety-Kleen  
Business Acquisition [Line Items]  
Summary of recognized amounts of identifiable assets acquired and liabilities assumed
The following table summarizes the recognized amounts of assets acquired and liabilities assumed at December 28, 2012 (in thousands):
 
Preliminary Allocations
 
Measurement Period Adjustments
 
Final Allocations
Inventories and supplies
$
102,339

 
$
5,037

 
$
107,376

Other current assets (i)
152,245

 
3,429

 
155,674

Property, plant and equipment
514,712

 
1,290

 
516,002

Permits and other intangibles
421,400

 
17,227

 
438,627

Other assets
4,985

 
(647
)
 
4,338

Current liabilities
(192,652
)
 
(13,589
)
 
(206,241
)
Closure and post-closure liabilities, less current portion
(15,774
)
 
8,221

 
(7,553
)
Remedial liabilities, less current portion
(38,370
)
 
(9,931
)
 
(48,301
)
Deferred taxes, unrecognized tax benefits and other long-term liabilities
(128,375
)
 
9,044

 
(119,331
)
Total identifiable net assets
820,510

 
20,081

 
840,591

Goodwill (ii)
436,749

 
(14,056
)
 
422,693

Total (iii)
$
1,257,259

 
$
6,025

 
$
1,263,284

_______________________
(i)
The fair value of the assets acquired includes customer receivables with an aggregate fair value of $137.6 million. Combined gross amounts due were $142.7 million.
(ii)
Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Based on the final purchase price allocations, goodwill of $173.2 million, $174.1 million and $75.4 million has been recorded in the Oil Re-refining and Recycling, SK Environmental Services and Industrial and Field Services segments, respectively, and will not be deductible for tax purposes.
(iii)
The $6.0 million increase in the purchase price in 2013 was due to finalization of the net working capital balance (excluding cash) as of the closing date.
Unaudited pro forma combined summary data
The following unaudited pro forma combined summary financial information presented below gives effect to the following transactions as if they had occurred as of January 1, 2011, and assumes that there were no material, non-recurring pro forma adjustments directly attributable to: (i) the acquisition of Safety-Kleen, (ii) the sale of 6.9 million shares of the Company's common stock, (iii) the issuance of $600.0 million aggregate principal amount of 5.125% senior unsecured notes due 2021, and (iv) the payment of related fees and expenses (in thousands).
 
2012
Pro forma combined revenues
$
3,529,592

Pro forma combined net income
$
125,425
Other 2012 Acquisitions  
Business Acquisition [Line Items]  
Unaudited pro forma combined summary data
The following unaudited pro forma combined financial data presents information as if the three other 2012 acquisitions had been acquired as of January 1, 2011 and assumes that there were no material, non-recurring pro forma adjustments directly attributable to those acquisitions. The pro forma financial information does not necessarily reflect the actual results that would have been reported had the Company and those three other acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).
 
2012
Pro forma combined revenues
$
2,268,621

Pro forma combined net income
$
130,322