Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE - Fair Value of Other Financial Instruments (Details)

v3.8.0.1
FAIR VALUE - Fair Value of Other Financial Instruments (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 846,118,074  
Debt instrument, unamortized discount 1,300,000  
Asset retirement obligations 1,000,000  
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Revolving credit facility 155,000,000  
Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of senior unsecured notes 431,800,000  
8% Senior Notes [Member] | Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 691,118,074 $ 700,000,000
Debt instrument, unamortized discount $ 1,326,001 $ 1,693,847