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Income Taxes Schedule of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:      
Deferred revenue on unredeemed observatory admission ticket sales $ 267 $ 390 $ 0
Loss carryforwards 0 0 1,125
Total deferred tax assets 267 390 1,125
Deferred tax liabilities:      
Total deferred tax liabilities 0 0 0
Total $ 267 $ 390 $ 1,125