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Marketable Securities and Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2017
Marketable Securities  
Unrealized Gain (Loss) on Investments

Below is a summary of our marketable securities portfolio as of June 30, 2017 and December 31, 2016.

(Amounts in thousands)As of June 30, 2017As of December 31, 2016
GAAPUnrealizedGAAPUnrealized
Fair ValueCostGainFair ValueCostGain
Equity securities:
Lexington Realty Trust$183,027$72,549$110,478$199,465$72,549$126,916
Other4,4626503,8124,2396503,589
$187,489$73,199$114,290$203,704$73,199$130,505