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Long-Term Debt - Schedule of Annual Principal Repayments (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2018 $ 14,588,000  
2019 33,625,000  
2020 10,408,000  
2021 5,349,000  
2022 4,500,000  
2023 428,625,000  
Totals 497,095,000 $ 0
Term Loan Facility, Term B Loan [Member]    
Debt Instrument [Line Items]    
Totals 450,000,000 0
Bangkok Bank Loan [Member]    
Debt Instrument [Line Items]    
Totals $ 16,000,000 $ 0