The following table provides a summary of changes to our goodwill balance by segment:
 
 
Refining and Marketing
 
Asphalt
 
Retail
 
Total
Balance at December 31, 2013
 
$
39,028

 
$
16,726

 
$
50,189

 
$
105,943

Decrease of goodwill (1)
 

 
(4,030
)
 

 
(4,030
)
Balance at December 31, 2014
 
39,028

 
12,696

 
50,189

 
101,913

Decrease of goodwill (2)
 
(39,028
)
 

 

 
(39,028
)
Balance at December 31, 2015
 

 
12,696

 
50,189

 
62,885

Increase of goodwill
 

 

 

 

Balance at December 31, 2016
 
$

 
$
12,696

 
$
50,189

 
$
62,885


________________
(1)
During the year ended December 31, 2014, we sold our Willbridge, Oregon asphalt terminal, which was allocated goodwill of $4,030 at the time of disposition.
(2)
The volatility in the crude price environment during 2015 caused a reduction in the growth rate for U.S. crude oil production, which subsequently caused a reduction in U.S. crude oil price discounts compared to waterborne crude prices. As a result, we have delayed planned projects within the California refining reporting unit, which had a negative effect on the timing of future cash flows. We recognized a goodwill impairment loss of $39,028 related to our California refining reporting unit for the year ended December 31, 2015.