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Cash and Investments (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) account investment affiliate | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Investment [Line Items] |  |  |
Number of required investment accounts | account | 1 |  |
Number of affiliate banks | affiliate | 1 |  |
Gain (loss) on sale of available-for-sale securities | $ 0 | $ 0 |
Other-than-temporary impairment charges on available-for-sale securities | $ 0 | $ 0 |
Number of investments in unrealized loss position | investment | 96 |  |
Gross unrealized losses | $ (255,000) |  | $ (322,000)
Unrealized loss position, aggregate fair value | 184,400,000 |  |
Corporate bonds [Member] |  |  |
Investment [Line Items] |  |  |
Gross unrealized losses | (220,000) |  | (308,000)
Unrealized loss position, aggregate fair value | $ 142,200,000 |  |
Silicon Valley Bank Term Loan and Line of Credit [Member] |  |  |
Investment [Line Items] |  |  |
Collateral balance |  |  | $ 81,600,000

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