Certain Financial Statement Information - Short-Term Investments Schedule of Maturities (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Schedule of cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity
Less than 1 year, Cost	$ 11,574
Mature in 1 - 2 years, Cost	31,700
Mature in 3 - 5 years, Cost	11,040
Mature after 5 years, Cost	0
Cost, Total	54,314
Less than 1 year, Fair Value	11,583
Mature in 1 - 2 years, Fair Value	31,730
Mature in 3 - 5 years, Fair Value	11,096
Mature after 5 years, Fair Value	0
Fair Value, Total	$ 54,409