Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE-FOR-SALE INVESTMENTS (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE-FOR-SALE INVESTMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Adjusted Cost $ 58,448 $ 57,486
Gross Unrealized Gains 8 (3)
Fair Value 58,456 57,483
Municipal Bonds and Notes    
Debt Instrument [Line Items]    
Adjusted Cost 24,873 35,222
Gross Unrealized Gains 8 2
Fair Value 24,881 35,224
Corporate Debt Securities    
Debt Instrument [Line Items]    
Adjusted Cost 1,345 5,029
Gross Unrealized Gains 0 (5)
Fair Value 1,345 5,024
Financial Institution Instruments    
Debt Instrument [Line Items]    
Adjusted Cost 32,230 17,235
Gross Unrealized Gains 0 0
Fair Value $ 32,230 $ 17,235