SELECTED FINANCIAL STATEMENT CAPTIONS - LIABILITIES (Details 1) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Other Long Term Liabilities [Line Items]
Other long-term liabilities	$ 33,750	$ 34,556	$ 36,222
Other Long-Term Liabilities [Member]
Other Long Term Liabilities [Line Items]
Other long-term liabilities	8
Unearned Revenue [Member]
Other Long Term Liabilities [Line Items]
Other long-term liabilities	10,500		10,000
Trade Discount [Member]
Other Long Term Liabilities [Line Items]
Other long-term liabilities	$ 23,242		$ 26,222