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Fair Value Measurement of Assets and Liabilities (Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Total Financial Assets	$ 373,223	$ 346,099
Contingent consideration	12,075	4,833
Total Financial Liabilities	12,075	4,833
Certificates of Deposit [Member]
Assets
Investments	9,519	7,807
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Total Financial Assets	250,338	146,672
Significant Other Observable Inputs (Level 2) [Member]
Assets
Total Financial Assets	122,885	199,427
Contingent consideration	12,075	4,833
Total Financial Liabilities	12,075	4,833
Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member]
Assets
Investments	9,519	7,807
Money Market Funds [Member]
Assets
Cash and Cash Equivalents	52,814	37,495
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and Cash Equivalents	52,814	37,495
Sovereign Debt Securities [Member]
Assets
Cash and Cash Equivalents	327
Investments	55,816	49,150
Sovereign Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and Cash Equivalents	327
Investments	53,874	49,150
Sovereign Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Investments	1,942
Corporate Debt Securities [Member]
Assets
Cash and Cash Equivalents	12,034	13,004
Investments	242,713	238,643
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Cash and Cash Equivalents		108
Investments	143,323	59,919
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets
Cash and Cash Equivalents	12,034	12,896
Investments	$ 99,390	$ 178,724

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Contingent Consideration, Fair Value Disclosure

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- Definition

Total financial assets.

+ References

No definition available.

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- Definition

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



-URI http://asc.fasb.org/extlink&oid=6506951



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Cash Equivalents



-URI http://asc.fasb.org/extlink&oid=6507016

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Trading Securities



-URI http://asc.fasb.org/extlink&oid=6526789



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 35



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 25



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Available-for-Sale Securities



-URI http://asc.fasb.org/extlink&oid=6505594



Reference 5: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 1



-Subparagraph a, f, g



-Article 7

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