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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2014
Marketable Securities [Abstract] |
Investments Available For Sale | Investments available for sale classified as non-current assets consist of:
| At June 30, 2014
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
SEI-sponsored mutual funds | $ | 7,686 |  |  | $ | 1,559 |  |  | $ | — |  |  | $ | 9,245 |
Equities and other mutual funds | 2,764 |  |  | 97 |  |  | — |  |  | 2,861 |
Debt securities | 71,598 |  |  | 1,800 |  |  | — |  |  | 73,398 |
| $ | 82,048 |  |  | $ | 3,456 |  |  | $ | — |  |  | $ | 85,504 |
| At December 31, 2013
| Cost Amount |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
SEI-sponsored mutual funds | $ | 7,612 |  |  | $ | 1,242 |  |  | $ | — |  |  | $ | 8,854 |
Equities and other mutual funds | 2,615 |  |  | 164 |  |  | — |  |  | 2,779 |
Debt securities | 71,280 |  |  | 410 |  |  | — |  |  | 71,690 |
| $ | 81,507 |  |  | $ | 1,816 |  |  | $ | — |  |  | $ | 83,323 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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