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Schedule of Principal Payments Due on Long-term Debt (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 9,759
2019 9,177
2020 9,111
2021 8,465
2022 8,143
Thereafter 962,343
Total outstanding principal of long-term debt $ 1,006,998