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Investment And Other Gains Investment And Other Gains (Tables)
 12 Months Ended
Dec. 31, 2016
Investment And Other Gains [Abstract]  
Schedule of Investment And Other Gains [Table Text Block]
The following table summarizes our investment and other gains (in thousands):
 
Year Ended December 31,
 
2016
 
2015
 
2014
Gains on sales of marketable securities
29,673

 
23,529

 
—

Gain on sale of real estate
4,582

 
1,126

 
—

Other gains
1,657

 
—

 
—

 
$
35,912

 
$
24,655

 
$
—