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Cash and Investments (Summary by Balance Sheet Line Item) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment [Line Items] |  |
Amortized Cost | $ 380,438 | $ 479,862
Gross Unrealized Gains | 41 | 14
Gross Unrealized Losses | (160) | (322)
Fair Value | 380,319 | 479,554
Cash and cash equivalents [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 135,212 | 151,686
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 135,212 | 151,686
Short-term investments [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 214,172 | 268,234
Gross Unrealized Gains | 15 | 13
Gross Unrealized Losses | (143) | (130)
Fair Value | 214,044 | 268,117
Long-term investments [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 26,404 | 55,792
Gross Unrealized Gains | 26 | 1
Gross Unrealized Losses | (17) | (192)
Fair Value | 26,413 | 55,601
Long-term restricted cash and investments [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 4,650 | 4,150
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 4,650 | $ 4,150

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