Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of estimated useful lives (Details)

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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of estimated useful lives (Details)
 12 Months Ended
Dec. 31, 2014
Buildings and improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 to 39 years
Furniture, fixtures and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 to 10 years