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Divestiture-Related Activities (Notes)
 3 Months Ended
Mar. 31, 2018
Divestiture-Related Activities [Abstract]  
Disposal Groups, Including Discontinued Operations, Disclosure
Divestiture-Related Activities
As divestitures occur in the normal course of business, gains or losses on the sale of such assets are recognized in the income statement line item Gains on divestitures and impairment charges, net, which consist of the following:
 
Three Months Ended
 
March 31,
 
2018
 
2017
 
(In thousands)
Gains on divestitures, net
$
1,276

 
$
16,751

Impairment losses
(794
)
 
(11,816
)
Gains on divestitures and impairment charges, net
$
482

 
$
4,935