Certain Financial Statement Information Cost and Fair Value of Available-for-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 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	$ 7,172
Mature in 1 - 2 years, Cost	7,030
Mature in 3 - 5 years, Cost	525
Mature after 5 years, Cost	1,140
Cost, Total	15,867
Less than 1 year, Fair Value	7,300
Mature in 1 - 2 years, Fair Value	7,080
Mature in 3 - 5 years, Fair Value	536
Mature after 5 years, Fair Value	1,312
Fair Value, Total	$ 16,228