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Marketable Securities and Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2017
Marketable Securities  
Unrealized Gain (Loss) on Investments

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

(Amounts in thousands)As of March 31, 2017As of December 31, 2016
GAAPUnrealizedGAAPUnrealized
Fair ValueCostGainFair ValueCostGain
Equity securities:
Lexington Realty Trust$184,320$72,549$111,771$199,465$72,549$126,916
Other4,3756503,7254,2396503,589
$188,695$73,199$115,496$203,704$73,199$130,505