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Divestiture-Related Activities (Tables)
 3 Months Ended
Mar. 31, 2018
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges
 
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