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Acquisitions and Divestiture-Related Activities (Tables)
 6 Months Ended
Jun. 30, 2018
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Gains on divestitures, net
$
6,865

 
$
5,922

 
$
8,141

 
$
22,673

Impairment losses
—

 
(5,169
)
 
(794
)
 
(16,985
)
Gains on divestitures and impairment charges, net
$
6,865

 
$
753

 
$
7,347

 
$
5,688