Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Estimated Fair Value Of Other Financial Assets And Liabilities (Details)

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FAIR VALUE MEASUREMENTS - Estimated Fair Value Of Other Financial Assets And Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion $ 175,044,083 $ 204,910
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion 174,682,210 203,938
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion $ 0 $ 0