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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Quarter
Mar. 31, 2012
Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]      
Number of quarters in trend basis 6    
Estimated percentage amount of wholesaler inventory (in hundredths) 90.00% 98.50%  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate (in hundredths) 2.23%   2.75%
Fair value of purchase consideration $ 14,400,000   $ 14,200,000
Non-cash interest expense 200,000    
Percentage of likelihood of purchase consideration becoming payable (in hundredths) 100.00%   100.00%
Long-term investments 10,420,000   10,299,000
Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 45,863,000   40,781,000
Total assets 45,863,000   40,781,000
Purchase consideration payable 14,433,000   14,208,000
Total liabilities 14,433,000   14,208,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Items (Level 1) [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 45,863,000   40,781,000
Total assets 45,863,000   40,781,000
Purchase consideration payable 0   0
Total liabilities 0   0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 0   0
Total assets 0   0
Purchase consideration payable 0   0
Total liabilities 0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash and cash equivalents 0   0
Total assets 0   0
Purchase consideration payable 14,433,000   14,208,000
Total liabilities $ 14,433,000   $ 14,208,000