Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 181,011
Gross Unrealized Gains	19
Gross Unrealized Losses	(160)
Fair Value	180,870
Marketable securities have been in a continuous unrealized loss position for more than twelve months	0
Marketable securities that we consider to be other-than-temporarily impaired	0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	143,233
Gross Unrealized Gains	12
Gross Unrealized Losses	(157)
Fair Value	143,088
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,150
Gross Unrealized Gains	1
Fair Value	18,151
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,211
Gross Unrealized Gains	4
Fair Value	10,215
Commercial Paper Not Included [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,747
Fair Value	3,747
International Government Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,270
Gross Unrealized Losses	(3)
Fair Value	2,267
Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,000
Fair Value	2,000
Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,400
Gross Unrealized Gains	2
Fair Value	$ 1,402

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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