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Unconsolidated Real Estate Joint Ventures (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
properties
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Payments to Acquire Productive Assets $ 187,460,000 $ 397,556,000 $ 219,169,000
Gain on sale of real estate 3,037,000 41,942,000 5,315,000
Income from investments in unconsolidated real estate joint venture (22,000) 72,000 619,000
Distributions from joint ventures $ 567,000 442,000 816,000
St. Petersburg Joint Venture [Member]      
Number of unconsolidated real estate joint ventures | properties 2    
Carrying Amount Joint Venture Mortgage Loan $ 60,000,000    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.75%    
Payments to Acquire Real Estate and Real Estate Joint Ventures $ 29,500,000    
Equity Method Investment, Ownership Percentage 65.00%    
Equity Method Investment, Partner's Ownership Percentage 35.00%    
Income from investments in unconsolidated real estate joint venture $ 52,000    
Distributions from joint ventures 0    
Theatre Project China Member      
Income from investments in unconsolidated real estate joint venture 74,000 72,000 619,000
Distributions from joint ventures 567,000 442,000 $ 816,000
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures $ 4,900,000 $ 5,600,000