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CASH FLOW INFORMATION - ASU 2018-15 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Accounting Standards Update    
Net cash used in operating activities $ 25,019 $ (1,169)
Net cash provided by investing activities $ 1,869 15,780
Previously reported    
Accounting Standards Update    
Net cash used in operating activities   (585)
Net cash provided by investing activities   15,196
ASU 2016-15 | Reclassification    
Accounting Standards Update    
Net cash used in operating activities   584
Net cash provided by investing activities   $ (584)