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Statements of Consolidated Operations (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue from related party $ 15,449,000 $ 15,458,000 $ 13,123,000
Earnings from unconsolidated companies, tax (benefit)/provision (4,451,000) 5,650,000 1,466,000
Discontinued operations, tax (benefit)/provision 0 0 0
Hotel Ritz, Madrid      
Revenue from related party 0 0 328,000
Interest income from related party $ 0 $ 0 $ 301,000