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Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual Funds $ 14,508 $ 17,227
Mutual Funds, fair value 14,508 17,227
Held-to-maturity securities, remaining maturities from 1-3 years 2,427 2,073
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 2,410 2,057
Held-to-maturity securities, remaining maturities from 3-5 years 1,088 1,453
Held-to-maturity securities, remaining maturities from 3-5 years, fair value 1,079 1,438
Held-to-maturity securities, maturities from 1-90 days 950 1,496
Held-to-maturity securities, maturities from 1-90 days, fair value 949 1,496
Held-to-maturity securities, maturities from 91-360 days 5,735 4,438
Held-to-maturity securities, maturities from 91-360 days, fair value 5,740 4,440
Held-to-maturity securities, maturities over 360 days 2,742 4,990
Held-to-maturity securities, maturities over 360 days, fair value 2,741 4,993
Investments 27,450 31,677
Investments, fair value 27,427 31,651
Fair Value Inputs Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mutual Funds, fair value 14,508 17,227
Investments, fair value 14,508 17,227
Fair Value Inputs Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity securities, remaining maturities from 1-3 years, fair value 2,410 2,057
Held-to-maturity securities, remaining maturities from 3-5 years, fair value 1,079 1,438
Held-to-maturity securities, maturities from 1-90 days, fair value 949 1,496
Held-to-maturity securities, maturities from 91-360 days, fair value 5,740 4,440
Held-to-maturity securities, maturities over 360 days, fair value 2,741 4,993
Investments, fair value $ 12,919 $ 14,424