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Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accrued Liabilities

    December 31, 2018     December 31, 2017
Accrued expenses $ 7,154   $ 2,764
Accrued interest   8,253     6,024
Total $ 15,407   $ 8,788