Cash, Cash Equivalents And Short-Term Investments (Contractual Maturities Of Short-Term Investments Designated As Available-For-Sale) (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost, Due in less than 1 year	$ 104,303
Fair Value, Due in less than 1 year	104,371
Adjusted Cost, Due in 1 to 5 years	94,638
Fair Value, Due in 1 to 5 years	85,645
Adjusted Cost, Total	198,941
Fair Value, Total	190,016
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost, Due in less than 1 year	36,937
Fair Value, Due in less than 1 year	36,959
Adjusted Cost, Due in 1 to 5 years	89,861
Fair Value, Due in 1 to 5 years	80,845
U.S. Treasuries And Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost, Due in less than 1 year	64,454
Fair Value, Due in less than 1 year	64,500
Adjusted Cost, Due in 1 to 5 years	4,777
Fair Value, Due in 1 to 5 years	4,800
Time Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost, Due in less than 1 year	2,912
Fair Value, Due in less than 1 year	$ 2,912