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Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 284,429
Gross Unrealized Gains	120
Gross Unrealized Losses	(294)
Fair Value	284,255
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	140,969
Gross Unrealized Gains	96
Gross Unrealized Losses	(179)
Fair Value	140,886
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,510
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	58,510
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,171
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	29,171
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,206
Gross Unrealized Gains	4
Gross Unrealized Losses	(43)
Fair Value	22,167
U.S. government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,619
Gross Unrealized Gains	11
Gross Unrealized Losses	(19)
Fair Value	15,611
Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,990
Gross Unrealized Gains	9
Gross Unrealized Losses	(52)
Fair Value	10,947
Treasury bills
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,964
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Value	$ 6,963

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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