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Marketable Securities - Summary of Available-for-sale Securities (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Summary of available-for-sale securities |  |
Available-for-sale securities, Cost | $ 52,597 | $ 55,200
Available-for-sale securities, Estimated Fair Value | 52,844 | 55,436
Level 1 | Certificates of deposit |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 1,290 | 1,690
Unrecognized losses for less than 12 months, Estimated Fair value | 1,282 | 1,677
Unrecognized losses for more than 12 months, Cost | 459 | 110
Unrecognized losses for more than 12 months, Estimated Fair value | 455 | 110
Unrecognized gains, Cost | 6,530 | 6,298
Unrecognized gains, Estimated Fair value | 6,560 | 6,334
Available-for-sale securities, Cost | 8,279 | 8,098
Available-for-sale securities, Estimated Fair Value | 8,297 | 8,121
Level 2 | U.S. Treasury and agency notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 3,434 | 4,672
Unrecognized losses for less than 12 months, Estimated Fair value | 3,427 | 4,664
Unrecognized losses for more than 12 months, Cost | 1,322 | 1,699
Unrecognized losses for more than 12 months, Estimated Fair value | 1,319 | 1,694
Unrecognized gains, Cost | 5,851 | 3,713
Unrecognized gains, Estimated Fair value | 5,889 | 3,760
Available-for-sale securities, Cost | 10,607 | 10,084
Available-for-sale securities, Estimated Fair Value | 10,635 | 10,118
Level 2 | Corporate notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 3,010 | 7,270
Unrecognized losses for less than 12 months, Estimated Fair value | 2,990 | 7,192
Unrecognized losses for more than 12 months, Cost | 1,338 | 530
Unrecognized losses for more than 12 months, Estimated Fair value | 1,334 | 523
Unrecognized gains, Cost | 23,338 | 21,945
Unrecognized gains, Estimated Fair value | 23,524 | 22,173
Available-for-sale securities, Cost | 27,686 | 29,745
Available-for-sale securities, Estimated Fair Value | 27,848 | 29,888
Level 2 | Municipal notes |  |
Summary of available-for-sale securities |  |
Unrecognized losses for less than 12 months, Cost | 419 | 1,688
Unrecognized losses for less than 12 months, Estimated Fair value | 417 | 1,677
Unrecognized losses for more than 12 months, Cost | 315 | 318
Unrecognized losses for more than 12 months, Estimated Fair value | 311 | 316
Unrecognized gains, Cost | 5,291 | 5,267
Unrecognized gains, Estimated Fair value | 5,336 | 5,316
Available-for-sale securities, Cost | 6,025 | 7,273
Available-for-sale securities, Estimated Fair Value | $ 6,064 | $ 7,309

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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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=27724398&loc=d3e27290-111563 + Details
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