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EQUITY INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]  
Earnings (losses) from equity investments
The following table presents earnings (losses) from equity investments for the periods indicated (in thousands): 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2016
 
2015
 
2016
 
2015
West Shore Pipe Line Company
$
1,784

 
$
2,033

 
$
5,680

 
$
6,209

Muskegon Pipeline LLC
544

 
(2,761
)
 
1,340

 
(3,345
)
Transport4, LLC
204

 
183

 
577

 
456

South Portland Terminal LLC
369

 
515

 
862

 
1,230

Total earnings (loss) from equity investments
$
2,901

 
$
(30
)
 
$
8,459

 
$
4,550
Summary of combined income statement data for equity method investments
Summarized combined income statement data for our equity method investments are as follows for the periods indicated (amounts represent 100% of investee income statement data in thousands): 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2016
 
2015
 
2016
 
2015
Revenue
$
22,831

 
$
24,440

 
$
65,877

 
$
68,786

Costs and expenses
(10,026
)
 
(16,642
)
 
(30,466
)
 
(43,256
)
Non-operating expenses
(4,142
)
 
(4,033
)
 
(11,425
)
 
(11,690
)
Net income
$
8,663

 
$
3,765

 
$
23,986

 
$
13,840