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RESTRUCTURING (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 42 Months Ended
Dec. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
ft²
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2012
USD ($)
RESTRUCTURING                
Restructuring Charges, Total   $ 13,669 $ 2,153 $ 5,550 $ 5,092 $ 874    
Accelerated depreciation   1,717   898 819      
Severance   865   435   430    
Iimpairment charges   $ 2,365   2,365        
Percentage of facility footprint planned to be reduced through the sale and/or closure   40.00%            
Area of facilities planned to be reduced through the sale and/or closure (in square feet) | ft²   600,000            
Number of facilities for which agreement has been reached to close or reduce leased presence | item   6            
Area of facilities for which agreement has been reached to close or reduce leased presence | ft²   400,000            
Number of remaining properties vacated and marketed for sale | item   2            
Liability associated with environmental remediation costs   $ 510           $ 352
Addition in liability associated with environmental remediation costs $ 258              
Restructuring Reserve, Settled without Cash             $ 4,800  
Capital Expenditures                
RESTRUCTURING                
Exit costs   5,627 674 2,352 2,596 5    
Moving And Other Exit Related Costs                
RESTRUCTURING                
Exit costs   6,680 $ 1,479 3,085 $ 1,677 $ 439    
Brandon Facility                
RESTRUCTURING                
Gain on sale of Brandon, SD Facility   $ (3,585)   $ (3,585)