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Divestiture Related Activities Divestiture Related Activities Level 3 (Tables)
 12 Months Ended
Dec. 31, 2017
Divestiture-Related Activities [Abstract]  
Gains (Losses) on Divestitures and Impairment Charges [Table Text Block]
As divestitures occur in the normal course of business, gains or losses on the sale of such locations are recognized in the income statement line item Gains (losses) on divestitures and impairment charges, net, which consist of the following for the years ended December 31:
 
2017
 
2016
 
2015
 
(In thousands)
Gains on divestitures, net
$
29,053

 
$
7,829

 
$
13,363

Impairment losses
(22,038
)
 
(34,648
)
 
(6,841
)
Gains (losses) on divestitures and impairment charges, net
$
7,015

 
$
(26,819
)
 
$
6,522
Schedule of Income from Discontinued Operations [Table Text Block]
 
2017
 
2016
 
2015
 
(In thousands)
Gains on divestitures, net
$
29,053

 
$
7,829

 
$
13,363

Impairment losses
(22,038
)
 
(34,648
)
 
(6,841
)
Gains (losses) on divestitures and impairment charges, net
$
7,015

 
$
(26,819
)
 
$
6,522