Certain Financial Statement Information Short-Term Investments Schedule of Maturities (Details) $ in Thousands	Jun. 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	$ 3,546
Mature in 1 - 2 years, Cost	7,518
Mature in 3 - 5 years, Cost	839
Mature after 5 years, Cost	0
Cost, Total	11,903
Less than 1 year, Fair Value	3,552
Mature in 1 - 2 years, Fair Value	7,519
Mature in 3 - 5 years, Fair Value	836
Mature after 5 years, Fair Value	6
Fair Value, Total	$ 11,913