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Marketable Securities, Fair Value Measurements and Notes Payable - Summary of available for sale securities and other investments (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale    
Equity securities, adjusted cost $ 41,526,000 $ 93,110,000
Equity securities, gross unrealized gains 14,097,000 16,278,000
Equity securities, gross unrealized losses (61,000) (2,439,000)
Equity securities, fair value 55,562,000 106,949,000
Debt securities, Fair Value 18,420  
Equity Securities    
Debt Securities, Available-for-sale    
Equity securities, adjusted cost 23,239,000 20,666,000
Equity securities, gross unrealized gains 13,918,000 16,154,000
Equity securities, gross unrealized losses (15,000) (18,000)
Equity securities, fair value 37,142,000 36,802,000
Equity Securities    
Debt Securities, Available-for-sale    
Equity securities, adjusted cost 4,012,000 1,439,000
Equity securities, gross unrealized gains 576,000 230,000
Equity securities, gross unrealized losses (15,000) (18,000)
Equity securities, fair value 4,573,000 1,651,000
Marco OP Units and Marco II OP Units    
Debt Securities, Available-for-sale    
Equity securities, adjusted cost 19,227,000 19,227,000
Equity securities, gross unrealized gains 13,342,000 15,924,000
Equity securities, fair value 32,569,000 35,151,000
Corporate Bonds and Preferred Securities    
Debt Securities, Available-for-sale    
Debt securities, adjusted cost 18,287,000 65,817,000
Debt securities, gross unrealized gains 179,000 124,000
Debt securities, gross unrealized losses (46,000) (2,120,000)
Debt securities, Fair Value $ 18,420,000 63,821,000
Mortgage Backed Securities ("MBS")    
Debt Securities, Available-for-sale    
Debt securities, adjusted cost   1,615,000
Debt securities, gross unrealized losses   (301,000)
Debt securities, Fair Value   1,314,000
Corporate Debt Securities    
Debt Securities, Available-for-sale    
Debt securities, adjusted cost   67,432,000
Debt securities, gross unrealized gains   124,000
Debt securities, gross unrealized losses   (2,421,000)
Debt securities, Fair Value   65,135,000
Other Investments    
Debt Securities, Available-for-sale    
Equity securities, adjusted cost   5,012,000
Equity securities, fair value   5,012,000
Certificates of Deposit    
Debt Securities, Available-for-sale    
Equity securities, adjusted cost   5,012,000
Equity securities, fair value   $ 5,012,000