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Long-term Investments (Details) - Auction rate securities - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Auction-rate securities, net of unrealized losses $ 2,633 $ 2,633
Auction-rate securities, unrealized holding losses, gross 117 117
Auction-rate securities, unrealized holding losses, net of taxes $ 70 $ 70
Discounted cash flow approach valuation technique    
Schedule of Available-for-sale Securities [Line Items]    
Fair value inputs, discount rate (as a percent) 1.99%  
Fair value inputs, time period until redemption 3 years  
Fair value inputs, estimated rate of return (as a percent) 0.50%  
Fair value investment, increase or decrease in rate of return (as a percent) 1.00%  
Fair value investment, increase or decrease in term 1 year  
Discounted cash flow approach valuation technique | Minimum    
Schedule of Available-for-sale Securities [Line Items]    
Fair value, change in investment portfolio (as a percent) 1.00%  
Discounted cash flow approach valuation technique | Maximum    
Schedule of Available-for-sale Securities [Line Items]    
Fair value, change in investment portfolio (as a percent) 3.00%