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
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, included in other current assets $ 5,000    
Long-term debt, including current portion 161,899   $ 162,275
Purchase of investments 5,000 $ 0  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, included in other current assets 0    
Long-term debt, including current portion 0   0
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, included in other current assets 4,648    
Long-term debt, including current portion 162,766   159,367
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments, included in other current assets 0    
Long-term debt, including current portion $ 0   $ 0