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Fair Value (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Significant Other Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Acquisition-related contingent consideration | $ 0 | $ 0
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Total assets | 53,011 | 63,851
Liabilities: |  |
Derivative instruments |  | $ 120
Acquisition-related contingent consideration |  |
Total liabilities |  | $ 120
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] |  |
Assets: |  |
Total assets | 22,918 | 23,692
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] |  |
Assets: |  |
Total assets |  | 1,800
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies and Securities [Member] |  |
Assets: |  |
Total assets | 1,615 | 3,022
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Total assets | 28,478 | 35,337
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Assets: |  |
Total assets | 1,615 | $ 3,022
Liabilities: |  |
Acquisition-related contingent consideration |  |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member] |  |
Assets: |  |
Total assets | 1,615 | $ 3,022
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Total assets | 51,396 | $ 60,829
Liabilities: |  |
Acquisition-related contingent consideration |  |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member] |  |
Assets: |  |
Total assets | 22,918 | $ 23,692
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member] |  |
Assets: |  |
Total assets |  | 1,800
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] |  |
Assets: |  |
Total assets | $ 28,478 | 35,337
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Liabilities: |  |
Derivative instruments |  | $ 120
Acquisition-related contingent consideration |  |
Total liabilities |  | $ 120

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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