Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.8.0.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 73,429 $ 73,470
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax (12) (2)
Available-for-sale Securities 73,417 73,468
Municipal Bonds and Notes [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 2,751 43,490
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 1 0
Available-for-sale Securities 2,752 43,490
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 24,194 1,673
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax (13) (2)
Available-for-sale Securities 24,181 1,671
Financial Institution Instruments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 46,484 28,307
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 0 0
Available-for-sale Securities $ 46,484 $ 28,307