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Cash and Investments (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) investment | Jun. 30, 2017 USD ($) account investment affiliate | Jun. 30, 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 | 75 | 75 |  |
Gross unrealized losses | $ (160,000) | $ (160,000) |  | $ (322,000)
Unrealized loss position, aggregate fair value | 133,200,000 | 133,200,000 |  |
Corporate bonds [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Gross unrealized losses | 0 | 0 |  | (308,000)
Unrealized loss position, aggregate fair value | 117,500,000 | 117,500,000 |  |
U.S. Treasury and government sponsored enterprises [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Gross unrealized losses | (28,000) | (28,000) |  | (14,000)
Unrealized loss position, aggregate fair value | $ 15,700,000 | $ 15,700,000 |  |
Silicon Valley Bank Term Loan and Line of Credit [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Collateral balance |  |  |  | $ 81,600,000

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