Certain Financial Statement Information Cost and Fair Value of Available-for-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014
Schedule of cost and estimated fair values of available-for-sale securities with stated maturities by contractual maturity
Less than 1 year, Cost	$ 7,663
Mature in 1 - 2 years, Cost	6,182
Mature in 3 - 5 years, Cost	704
Mature after 5 years, Cost	828
Cost, Total	15,377
Less than 1 year, Fair Value	7,762
Mature in 1 - 2 years, Fair Value	6,221
Mature in 3 - 5 years, Fair Value	714
Mature after 5 years, Fair Value	1,006
Fair Value, Total	$ 15,703