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Fair Value Measurements - Narrative (Details) (USD $) |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Money market funds | Mar. 31, 2013 Money market funds | Mar. 31, 2014 Other mutual funds | Dec. 31, 2013 Other mutual funds | Mar. 31, 2014 Fair Value, Measurements, Recurring | Mar. 31, 2013 Fair Value, Measurements, Recurring | Mar. 31, 2014 Fair Value, Measurements, Recurring Money market funds | Mar. 31, 2013 Fair Value, Measurements, Recurring Money market funds | Mar. 31, 2014 Fair Value, Measurements, Recurring Other mutual funds | Dec. 31, 2013 Fair Value, Measurements, Recurring Other mutual funds | Mar. 31, 2013 Fair Value, Measurements, Recurring Other mutual funds
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure |  |  |  |  |  |  | $ 3,832,000 | $ 2,141,000 | $ 1,818,000 | $ 118,000 | $ 2,014,000 | $ 2,000,000 | $ 2,023,000
Unrealized gains on the investments |  |  | 0 | 0 | 705,000 | 700,000 |  |  |  |  |  |  |
Unrealized gains on the investments after-tax | $ 438,000 | $ 429,000 |  |  |  |  |  |  |  |  |  |  |

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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 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: 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=28358780&loc=d3e637-108580 Reference 3: 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=28358780&loc=d3e681-108580 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=28358780&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=25499696&loc=d3e19207-110258 + Details
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