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Investment And Other Gains (Tables)
 6 Months Ended
Jun. 30, 2018
Investment And Other Gains [Abstract]  
Schedule of Investment And Other Gains
The following table summarizes our investment and other gains (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,

2018
 
2017
 
2018
 
2017
Gain on sale of real estate
$
—

 
$
—

 
$
—

 
$
50

Gain on sales of marketable securities
—

 
—

 
—

 
10,038

 
$
—

 
$
—

 
$
—

 
$
10,088