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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]  
Summarized Information on Results of Discontinued Operations
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