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Fair Value Measurements - Narrative (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Unrealized gains on the investments after-tax | $ 346,000 | $ 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 | 600,000 | 800,000
Unrealized gains on the investments after-tax | 300,000 | 500,000
Fair Value, Measurements, Recurring |  |
Cash and Cash Equivalents [Line Items] |  |
Assets, Fair Value Disclosure | 2,310,000 | 11,054,000
Fair Value, Measurements, Recurring | Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Assets, Fair Value Disclosure | 118,000 | 8,518,000
Fair Value, Measurements, Recurring | Other mutual funds |  |
Cash and Cash Equivalents [Line Items] |  |
Assets, Fair Value Disclosure | $ 2,192,000 | $ 2,536,000

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