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Divestiture-Related Activities (Tables)
 6 Months Ended
Jun. 30, 2015
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges
 
Three Months Ended
 
Six Months Ended
 
June 30
 
June 30
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
(Losses) gains on divestitures, net
$
(4,940
)
 
$
35,937

 
$
(3,027
)
 
$
37,864

Impairment losses
(642
)
 
(943
)
 
(4,334
)
 
$
(5,682
)
 
$
(5,582
)
 
$
34,994

 
$
(7,361
)
 
$
32,182