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Divestiture-Related Activities (Tables)
 9 Months Ended
Sep. 30, 2017
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
(Losses) gains on divestitures, net
$
(62
)
 
$
864

 
$
22,611

 
$
2,974

Impairment losses
(81
)
 
(307
)
 
(17,066
)
 
(33,406
)
(Losses) gains on divestitures and impairment charges, net
$
(143
)
 
$
557

 
$
5,545

 
$
(30,432
)