Fair Value Measurements - Narrative (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
Unrealized gains on the investments after-tax	$ 631,000	$ 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	900,000	800,000
Fair Value, Measurements, Recurring
Cash and Cash Equivalents [Line Items]
Assets, Fair Value Disclosure	15,199,000	11,054,000
Fair Value, Measurements, Recurring \| Money market funds
Cash and Cash Equivalents [Line Items]
Assets, Fair Value Disclosure	12,619,000	8,518,000
Fair Value, Measurements, Recurring \| Other mutual funds
Cash and Cash Equivalents [Line Items]
Assets, Fair Value Disclosure	$ 2,580,000	$ 2,536,000

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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