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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Change in Accounting Principle - Additional Information (Details) - Accounting Standards Update 2014-01 - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of change on equity or net assets $ (274)  
Effect of change on net income $ (113) $ (163)