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Investment And Other Gains (Tables)
3 Months Ended
Mar. 31, 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
 
March 31,

2018
 
2017
Gains on sale of real estate
$

 
$
50

Gains on sales of marketable securities

 
10,038

 
$

 
$
10,088