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INCOME TAXES - Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income tax expense:        
Total income tax expense $ 319 $ 394 $ 349 $ 1,399