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Investment And Other Gains (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
Nine Months Ended
 
September 30,
 
September 30,

2017
 
2016
 
2017
 
2016
Gains on sales of real estate
$
—

 
$
—

 
$
50

 
$
4,582

Gains on sales of marketable securities
—

 
—

 
10,038

 
23,498

Gain on disposal of equity-method investee
—

 
1,657

 
—

 
1,657

 
$
—

 
$
1,657

 
$
10,088

 
$
29,737