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INCOME TAXES INCOME TAXES - SUMMARY OF INCOME (LOSS) BEFORE INCOME TAXES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income (loss) before income taxes      
United States $ (72,556) $ (148,683) $ (197,976)
Foreign 78,608 87,217 52,723
Total income (loss) before income taxes $ 6,052 $ (61,466) $ (145,253)