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Cash and Investments (Available for Sale by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Mature within One Year | $ 411,603 |
After One Year through Two Years | 45,353 |
Fair Value | 456,956 | $ 459,966
Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mature within One Year | 44,641 |
After One Year through Two Years | 0 |
Fair Value | 44,641 | 71,457
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mature within One Year | 193,968 |
After One Year through Two Years | 0 |
Fair Value | 193,968 | 165,375
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mature within One Year | 132,355 |
After One Year through Two Years | 42,706 |
Fair Value | 175,061 | 152,407
U.S. Treasury and government sponsored enterprises [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Mature within One Year | 40,639 |
After One Year through Two Years | 2,647 |
Fair Value | $ 43,286 | $ 70,727

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