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OTHER LONG-TERM LIABILITIES Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-term accrued restructuring     $ 200
Long-term deferred compensation $ 5,087 $ 5,186  
Other Accrued Liabilities, Noncurrent 327 460  
Other long-term liabilities $ 5,414 $ 5,646