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Marketable Securities - Summary of Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 52,671 | $ 55,200
Available-for-sale securities, Estimated Fair Value | 52,919 | 55,436
Level 1 | Certificates of deposit |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 1,362 | 1,690
Unrecognized losses for less than 12 months, Estimated Fair value | 1,345 | 1,677
Unrecognized losses for more than 12 months, Cost | 359 | 110
Unrecognized losses for more than 12 months, Estimated Fair value | 355 | 110
Unrecognized gains, Cost | 6,645 | 6,298
Unrecognized gains, Estimated Fair value | 6,681 | 6,334
Available-for-sale securities, Cost | 8,366 | 8,098
Available-for-sale securities, Estimated Fair Value | 8,381 | 8,121
Level 2 | U.S. Treasury and agency notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 3,289 | 4,672
Unrecognized losses for less than 12 months, Estimated Fair value | 3,281 | 4,664
Unrecognized losses for more than 12 months, Cost | 1,702 | 1,699
Unrecognized losses for more than 12 months, Estimated Fair value | 1,699 | 1,694
Unrecognized gains, Cost | 4,581 | 3,713
Unrecognized gains, Estimated Fair value | 4,621 | 3,760
Available-for-sale securities, Cost | 9,572 | 10,084
Available-for-sale securities, Estimated Fair Value | 9,601 | 10,118
Level 2 | Corporate notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 4,105 | 7,270
Unrecognized losses for less than 12 months, Estimated Fair value | 4,076 | 7,192
Unrecognized losses for more than 12 months, Cost | 1,796 | 530
Unrecognized losses for more than 12 months, Estimated Fair value | 1,787 | 523
Unrecognized gains, Cost | 21,926 | 21,945
Unrecognized gains, Estimated Fair value | 22,123 | 22,173
Available-for-sale securities, Cost | 27,827 | 29,745
Available-for-sale securities, Estimated Fair Value | 27,986 | 29,888
Level 2 | Municipal notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 524 | 1,688
Unrecognized losses for less than 12 months, Estimated Fair value | 520 | 1,677
Unrecognized losses for more than 12 months, Cost | 249 | 318
Unrecognized losses for more than 12 months, Estimated Fair value | 247 | 316
Unrecognized gains, Cost | 6,133 | 5,267
Unrecognized gains, Estimated Fair value | 6,184 | 5,316
Available-for-sale securities, Cost | 6,906 | 7,273
Available-for-sale securities, Estimated Fair Value | $ 6,951 | $ 7,309

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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