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Stock Plans (Details 2) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Goods and Nonemployee Services Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average risk-free interest rate | 1.70% |  | 1.00% |  | 2.00% |  | 0.80% |  | 0.92% |  | 0.91% |  | 2.30% |
Expected dividend payments | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |
Expected holding period (years) | 4 years 2 months 12 days | [1] | 3 years 10 months 24 days | [1] | 6 years 6 months | [1] | 4 years 2 months 12 days | [1] | 3 years 10 months 24 days | [2] | 5 years 1 month 6 days | [2] | 5 years 4 months 24 days | [2]
Weighted-average volatility factor | 1.67 | [3] | 1.56 | [3] | 1.66 | [3] | 1.70 | [3] | 1.38 | [3] | 1.75 | [3] | 1.71 | [3]
Estimated forfeiture rates for options granted to management | 31.00% | [4] | 32.00% | [4] | 31.00% | [4] | 32.00% | [4] | 23.00% | [4] | 23.00% | [4] | 23.00% | [4]
Estimated forfeiture rates for options granted to non-management |  |  |  |  |  |  |  |  | 41.00% | [4] | 41.00% | [4] | 41.00% | [4]
[1] | Expected holding periods are based on the simplified method provided in Staff Accounting Bulletin No. 107 for “plain vanilla options.”
[2] | Expected holding period is based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and the expectations of future employee behavior.
[3] | Weighted average volatility is based on the historical volatility of our common stock.
[4] | Estimated forfeiture rates are based on historical data.

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- Definition Share based goods and nonemployee services transaction valuation method weighted average volatility factor. + References No definition available. + Details
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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing a nonvested share or option award issued to other than an employee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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