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Notes Payable and Long-Term Debt, Note Payable - IVG (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Notes Payable and Long-Term Debt [Abstract]    
Note payable $ 324,740 $ 198,000
Note Payable - IVG [Member]    
Notes Payable and Long-Term Debt [Abstract]    
Face amount $ 4,000  
Interest rate 6.00%  
Maturity date Mar. 05, 2020  
Note payable $ 4,240 $ 4,000