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Divestiture-Related Activities Divestiture-Related Activities (Tables)
 3 Months Ended
Mar. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges [Table Text Block]
 
Three Months Ended
 
March 31
 
2014
 
2013
 
 
 
 
(Losses) gains on divestitures, net
$
1,927

 
$
(891
)
Impairment losses
(4,739
)
 
(78
)
 
$
(2,812
)
 
$
(969
)