Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
FAIR VALUE MEASUREMENTS - Estimated Fair Value Of Other Financial Assets And Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion $ 190,766 $ 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 191,138 203,938
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, including current portion $ 0 $ 0