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CASH FLOW INFORMATION - ASU 2018-15 (Details) - USD ($) $ in Thousands | 6 Months Ended
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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)

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