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Discontinued Operations
 12 Months Ended
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued Operations
DISCONTINUED OPERATIONS
On December 31, 2012, we completed the sale of SemStream's Arizona residential business which was classified as a discontinued operation. The sale resulted in a gain of $3.1 million. There continues to be an insignificant amount of activity related to ongoing bankruptcy matters which is reflected in the results below and is related to operations discontinued during bankruptcy.
Certain summarized information on the results of discontinued operations is shown below (in thousands): 
 
Year Ended December 31, 2014
 
Year Ended December 31, 2013
 
Year Ended December 31, 2012
External revenue
$
—

 
$
—

 
$
13,518

Gain on disposal of long-lived assets, net
$
—

 
$
—

 
$
3,090

Income (loss) from discontinued operations before income taxes
$
(1
)
 
$
59

 
$
2,935

Income tax benefit
—

 
—

 
(4
)
Income (loss) from discontinued operations, net of income taxes
$
(1
)
 
$
59

 
$
2,939