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Fair Value Measurements - Narrative (Details) (USD $)			6 Months Ended			12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Money market funds	Jun. 30, 2013 Money market funds	Jun. 30, 2014 Other mutual funds	Dec. 31, 2013 Other mutual funds	Jun. 30, 2014 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Measurements, Recurring	Jun. 30, 2014 Fair Value, Measurements, Recurring Money market funds	Dec. 31, 2013 Fair Value, Measurements, Recurring Money market funds	Jun. 30, 2014 Fair Value, Measurements, Recurring Other mutual funds	Dec. 31, 2013 Fair Value, Measurements, Recurring Other mutual funds
Cash and Cash Equivalents [Line Items]
Assets, Fair Value Disclosure							$ 3,237,000	$ 2,141,000	$ 600,000	$ 100,000	$ 2,600,000	$ 2,000,000
Unrealized gains on the investments			0	0	800,000	700,000
Unrealized gains on the investments after-tax	$ 500,000	$ 400,000

X

- Definition

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

+ References

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



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-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

-Topic 820

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- Definition

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

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-Name Accounting Standards Codification

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