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Fair Value Measurements - Narrative (Details) (USD $) |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
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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 |  |  |  |  |  |  |  |  |  |

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- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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