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Share-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified |  | 6 Months Ended |  |  |  |
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Jun. 30, 2013 | Jun. 30, 2013 Stock Option Plans [Member] | Jun. 30, 2012 Stock Option Plans [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2013 Employee Stock Purchase Plan (ESPP) [Member] | Apr. 12, 2011 Employee Stock Purchase Plan (ESPP) [Member] offering | Feb. 12, 2004 Employee Stock Purchase Plan (ESPP) [Member] offering | Jan. 01, 2000 Employee Stock Purchase Plan (ESPP) [Member] offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance | 5,550 |  |  |  |  |  |  |
Shares available for future grant |  | 2,781 |  |  | 2,541 |  |  |
Maximum term of grants |  | 10 years |  |  |  |  |  |
Options vested and exercisable, period |  | 5 years |  |  |  |  |  |
Weighted average grant-date fair value of stock options granted |  | $ 6.81 | $ 4.74 |  |  |  |  |
Restricted stock granted |  |  |  | 6 |  |  |  |
Weighted average grant date fair value of restricted stock granted |  |  |  | $ 23.50 |  |  |  |
Number of initial offerings |  |  |  |  |  |  |  | 5
Number of additional offerings |  |  |  |  |  | 5 | 8 |
Stock options authorized to issue to employees |  |  |  |  | 4,050 |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Maximum Term of Grants. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Offerings + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Initial Offerings + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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