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Bank and Other Notes Payable - Future Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Mortgage loans payable on real estate    
Deferred finance cost $ (13,053) $ (17,838)
Bank and other notes payable    
Mortgage loans payable on real estate    
2019 887  
2020 934  
2021 911,868  
Long term debt including debt premium 913,689  
Deferred finance cost (5,145)  
Long-term debt $ 908,544