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Marketable Securities (Amortized Cost And Fair Value Of Marketable Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 228,880 | $ 213,804
Gross Unrealized Gains | 228 | 25
Gross Unrealized Losses | (45) | (238)
Fair Value | 229,063 | 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 | 144,591 | 177,810
Gross Unrealized Gains | 131 | 24
Gross Unrealized Losses | (45) | (221)
Fair Value | 144,677 | 177,613
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 28,263 |
Gross Unrealized Gains | 70 |
Fair Value | 28,333 |
Certificates Of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 20,800 | 3,500
Fair Value | 20,800 | 3,500
Commercial Paper - Marketable Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,224 | 3,491
Fair Value | 18,224 | 3,491
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 12,601 | 12,881
Gross Unrealized Gains | 21 |
Gross Unrealized Losses |  | (10)
Fair Value | 12,622 | 12,871
Agency Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,400 | 12,068
Gross Unrealized Gains | 1 |
Gross Unrealized Losses |  | (3)
Fair Value | 2,401 | 12,065
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,400 | 1,400
Gross Unrealized Gains | 5 |
Gross Unrealized Losses |  | (1)
Fair Value | 1,405 | 1,399
International Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 601 | 1,462
Gross Unrealized Losses |  | (3)
Fair Value | $ 601 | 1,459
Treasury Bills [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 1,192
Gross Unrealized Gains |  | 1
Fair Value |  | $ 1,193

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