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Fair Value Measurements - Narrative (Details) € in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Oct. 05, 2015 EUR (€) | Oct. 05, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Cash and Cash Equivalents [Line Items] |  |  |  |
Unrealized gains on the investments after-tax |  |  | $ 451,000 | $ 471,000
Money market funds |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Unrealized gains on the investments |  |  | 0 |
Other mutual funds |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Unrealized gains on the investments |  |  | 700,000 | 800,000
Fair Value, Measurements, Recurring |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  |  | 9,681,000 | 11,054,000
Fair Value, Measurements, Recurring | Money market funds |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  |  | 7,519,000 | 8,518,000
Fair Value, Measurements, Recurring | Other mutual funds |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  |  | 2,162,000 | $ 2,536,000
N200 Limited and Affiliates |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Increase in contingent liability |  |  | $ 100,000 |
Subsequent Event | N200 Limited and Affiliates |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Payment of contingent liability | € 1.0 | $ 1,100,000 |  |

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