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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Short-term investments	$ 2,280	$ 18,686
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	160,177	196,077
Short-term investments	2,280	18,686
Recurring | Significant Unobservable Inputs (Level 3)
Liabilities
Contingent consideration	5,403	9,233
Recurring | Amount Recorded on Balance Sheet
Assets
Cash and cash equivalents	160,177	196,077
Short-term investments	2,280	18,686
Liabilities
Contingent consideration	$ 5,403	$ 9,233

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Amount of liability recognized arising from contingent consideration in a business combination.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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-Section S99

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-Number 210

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