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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost and estimated fair value of the Company’s Marketable Securities as of September 30, 2013 and December 31, 2012 were as follows:
| September 30, 2013 |  | December 31, 2012
| Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Securities Investments | $ | 11,178 |  |  | $ | 592 |  |  | $ | 9 |  |  | $ | 11,761 |  |  | $ | 10,172 |  |  | $ | 1,428 |  |  | $ | 20 |  |  | $ | 11,580 |
Debt Securities Carried by EGL | 20,335 |  |  | 61 |  |  | 2 |  |  | 20,394 |  |  | 13,522 |  |  | 97 |  |  | — |  |  | 13,619 |
Mutual Funds | 7,765 |  |  | 1,198 |  |  | 75 |  |  | 8,888 |  |  | 10,946 |  |  | 412 |  |  | 12 |  |  | 11,346 |
Total | $ | 39,278 |  |  | $ | 1,851 |  |  | $ | 86 |  |  | $ | 41,043 |  |  | $ | 34,640 |  |  | $ | 1,937 |  |  | $ | 32 |  |  | $ | 36,545 |
Investments Classified by Contractual Maturity Date | Scheduled maturities of the Company’s available-for-sale debt securities within the Securities Investments portfolio as of September 30, 2013 and December 31, 2012 were as follows:
| September 30, 2013 |  | December 31, 2012
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 615 |  |  | $ | 616 |  |  | $ | 658 |  |  | $ | 659 |
Due after one year through five years | 799 |  |  | 810 |  |  | 1,415 |  |  | 1,437 |
Due after five years through 10 years | 207 |  |  | 207 |  |  | 347 |  |  | 346 |
Total | $ | 1,621 |  |  | $ | 1,633 |  |  | $ | 2,420 |  |  | $ | 2,442 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
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