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Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 217,568	$ 213,804
Gross Unrealized Gains	140	25
Gross Unrealized Losses	(91)	(238)
Fair Value	217,617	213,591
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	152,383	177,810
Gross Unrealized Gains	85	24
Gross Unrealized Losses	(90)	(221)
Fair Value	152,378	177,613
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,430
Gross Unrealized Gains	37
Fair Value	24,467
U.S. Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,057	12,881
Gross Unrealized Gains	11
Gross Unrealized Losses		(10)
Fair Value	17,068	12,871
Commercial Paper - Marketable Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,840	3,491
Fair Value	9,840	3,491
Certificates Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,600	3,500
Fair Value	8,600	3,500
Agency Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,401	12,068
Gross Unrealized Losses		(3)
Fair Value	2,401	12,065
International Government Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,457	1,462
Gross Unrealized Losses	(1)	(3)
Fair Value	1,456	1,459
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,400	1,400
Gross Unrealized Gains	7
Gross Unrealized Losses		(1)
Fair Value	$ 1,407	1,399
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,192
Gross Unrealized Gains		1
Fair Value		$ 1,193

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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