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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Foreign currency forward contracts | $ 114 | [1] |  |
Interest rate swaps | 332 | [2] | 542 | [2]
Money market mutual funds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 19,957 | [3] | 9,921 | [3]
Government agency bonds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 8,041 | [3] | 6,818 | [3]
United States treasuries |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 7,509 | [3] | 6,089 | [3]
Corporate notes |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 8,453 | [3] | 4,679 | [3]
Certificates of deposit |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 2,426 | [3] | 1,800 | [3]
Level 1 |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Foreign currency forward contracts | 0 | [1] |  |
Interest rate swaps | 0 | [2] | 0 | [2]
Level 1 | Money market mutual funds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 19,957 | [3] | 9,921 | [3]
Level 1 | Government agency bonds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 8,041 | [3] | 6,818 | [3]
Level 1 | United States treasuries |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 7,509 | [3] | 6,089 | [3]
Level 1 | Corporate notes |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 8,453 | [3] | 4,679 | [3]
Level 1 | Certificates of deposit |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 2,426 | [3] | 1,800 | [3]
Level 2 |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Foreign currency forward contracts | 114 | [1] |  |
Interest rate swaps | 332 | [2] | 542 | [2]
Level 2 | Money market mutual funds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 2 | Government agency bonds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 2 | United States treasuries |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 2 | Corporate notes |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 2 | Certificates of deposit |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 3 |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Foreign currency forward contracts | 0 | [1] |  |
Interest rate swaps | 0 | [2] | 0 | [2]
Level 3 | Money market mutual funds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 3 | Government agency bonds |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 3 | United States treasuries |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 3 | Corporate notes |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | 0 | [3] | 0 | [3]
Level 3 | Certificates of deposit |  |  |  |
Schedule of assets and liabilities measured at fair value on recurring basis |  |  |  |
Assets measured at fair value | $ 0 | [3] | $ 0 | [3]
[1] | The valuations of foreign currency forward contracts are determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including commodity forward curves, and reflects the contractual terms of these instruments, including the period to maturity.
[2] | The valuations of the interest rate swaps intended to mitigate the Company’s interest rate risk are determined with the assistance of a third-party financial institution using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each instrument. This analysis utilizes observable market-based inputs, including interest rate curves and interest rate volatility, and reflects the contractual terms of these instruments, including the period to maturity.
[3] | Market approach—prices and other relevant information generated by market transactions involving identical or comparable assets.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: 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=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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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