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Asset Impairment Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Impairment Charges [Abstract]  
Asset Impairment Charges

 

 

Year Ended December 31,

 

(In thousands)

 

2017

 

 

2016

 

 

2015

 

Asset impairment charges

 

$

0

 

 

$

4,650

 

 

$

1,544

 

Impairment of and losses on long-term investments

 

$

165,290

 

 

$

0

 

 

$

0