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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassification (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Effect of Reclassification Adjustments [Line Items]      
Income from operations $ 30,331 $ 22,820  
Previously reported      
Effect of Reclassification Adjustments [Line Items]      
Income from operations     $ 0
After reclassification adjustment      
Effect of Reclassification Adjustments [Line Items]      
Income from operations     $ 0