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Schedule of Principal Payments Due on Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 8,497  
2021 8,360  
2022 10,182  
2023 8,450  
2024 8,187  
Thereafter 1,122,156  
Total long-term debt $ 1,165,832 $ 1,000,238