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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
FAIR VALUE MEASUREMENTS    
Municipal bonds and money market funds $ 11,396 $ 26,079
Impairment to identifiable intangible assets 0  
Impairment to property and equipment assets 0  
Gearing
   
FAIR VALUE MEASUREMENTS    
Impairment charge recorded to reduce the carrying value of assets to fair value 0  
Services
   
FAIR VALUE MEASUREMENTS    
Impairment charge recorded to reduce the carrying value of assets to fair value 0  
Level 2
   
FAIR VALUE MEASUREMENTS    
Total assets at fair value 2,200 14,058
Level 3
   
FAIR VALUE MEASUREMENTS    
Total assets at fair value 2,142 2,530
Total
   
FAIR VALUE MEASUREMENTS    
Total assets at fair value 4,342 16,588
Recurring | Level 2 | Municipal bonds and money market funds
   
FAIR VALUE MEASUREMENTS    
Municipal bonds and money market funds 2,200 14,058
Recurring | Total | Municipal bonds and money market funds
   
FAIR VALUE MEASUREMENTS    
Municipal bonds and money market funds 2,200 14,058
Nonrecurring | Level 3 | Gearing equipment
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value 761 1,149
Nonrecurring | Level 3 | Clintonville, WI facility
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value 821 821
Nonrecurring | Level 3 | Gearing Cicero Ave. facility
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value 560 560
Nonrecurring | Total | Gearing equipment
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value 761 1,149
Nonrecurring | Total | Clintonville, WI facility
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value 821 821
Nonrecurring | Total | Gearing Cicero Ave. facility
   
FAIR VALUE MEASUREMENTS    
Property plant and equipment at fair value $ 560 $ 560