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Fair Value Measurements
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS
We estimated our Senior Notes due in 2024 to have a fair value of $356 million at June 30, 2019 and $338 million at December 31, 2018 based upon market quotations.
Carrying amounts reported on the balance sheet for cash and cash equivalents, accounts receivables, accounts payable and current portion of long-term debt approximate fair value due to the short-term maturity of these items.