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Long-Term Loans, Related Party (Details) - USD ($)
Mar. 31, 2018
Mar. 05, 2018
Dec. 31, 2017
Dec. 28, 2017
Jan. 24, 2017
Debt Instrument [Line Items]          
Debt Instrument, Covenant, Tax Sharing Agreement, Distributions Percentage of Net Revenues, Maximum         1.00%
Common Stock, Shares, Issued 32,560,000 200,000 31,156,000    
Long-term Debt $ 482,513,000   $ 469,736,000    
Kien Huat Montreign Loan [Member]          
Debt Instrument [Line Items]          
Long-term Debt       $ 36,200,000.0  
Exchange rate (usd per share) $ 26.21        
Kien Huat Montreign Loan [Member] | Montreign Operating [Member]          
Debt Instrument [Line Items]          
Principal amount of promissory note         $ 32,300,000.0
Kien Huat Note Exchange Agreement [Member]          
Debt Instrument [Line Items]          
Common Stock, Shares, Issued       1,379,873  
Kien Huat Backstop Loan [Member]          
Debt Instrument [Line Items]          
Principal amount of promissory note $ 20,000,000