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STOCK-BASED COMPENSATION - Adoption of ASU No. 2016-09 (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Prospective adoption    
Provision for income taxes $ (1,706) $ (1,736)
ASU 2016-09    
Prospective adoption    
Provision for income taxes $ 253 $ 145
Increase of basic and diluted earnings per share $ 0.01 $ 0.01