Quarterly report pursuant to Section 13 or 15(d)

DEBT - Schedule of Maturities of Debt (Details)

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DEBT - Schedule of Maturities of Debt (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2012
Debt Instrument [Line Items]    
Less than 1 Year $ 58,965,000  
1 Year 2,500,000  
2 Years 2,500,000  
3 Years 2,500,000  
4 Years 64,150,000  
More than 5 Years 0  
Carrying Value 130,615,000  
4.50% convertible subordinated notes    
Debt Instrument [Line Items]    
Less than 1 Year 57,090,000  
1 Year 0  
2 Years 0  
3 Years 0  
4 Years 0  
More than 5 Years 0  
Carrying Value $ 57,090,000 $ 70,000,000
Stated interest rate 4.50% 4.50%
Revolving credit agreement    
Debt Instrument [Line Items]    
Less than 1 Year $ 0  
1 Year 0  
2 Years 0  
3 Years 0  
4 Years 23,525,000  
More than 5 Years 0  
Carrying Value 23,525,000  
Term loan agreement    
Debt Instrument [Line Items]    
Less than 1 Year 1,875,000  
1 Year 2,500,000  
2 Years 2,500,000  
3 Years 2,500,000  
4 Years 40,625,000  
More than 5 Years 0  
Carrying Value 50,000,000  
Total long-term debt    
Debt Instrument [Line Items]    
Less than 1 Year 1,875,000  
1 Year 2,500,000  
2 Years 2,500,000  
3 Years 2,500,000  
4 Years 64,150,000  
More than 5 Years 0  
Carrying Value $ 73,525,000