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Investments - Held-to-maturity securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Carrying Value $ 8,503 $ 14,450
Unrealized Gain 18 11
Unrealized Loss (6) (37)
Fair Value 8,515 14,424
Fixed Income Bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Carrying Value 3,513 3,526
Unrealized Gain 11 0
Unrealized Loss (6) (32)
Fair Value 3,518 3,494
Time Deposits    
Schedule of Held-to-maturity Securities [Line Items]    
Carrying Value 4,990 10,924
Unrealized Gain 7 11
Unrealized Loss 0 (5)
Fair Value $ 4,997 $ 10,930