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Divestiture-Related Activities (Tables)
 6 Months Ended
Jun. 30, 2017
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Gains on divestitures, net
$
5,922

 
$
685

 
$
22,673

 
$
2,111

Impairment losses
(5,169
)
 
(31,326
)
 
(16,985
)
 
(33,099
)
Gains (losses) on divestitures and impairment charges, net
$
753

 
$
(30,641
)
 
$
5,688

 
$
(30,988
)