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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments
Money Market Funds	$ 57,738	$ 54,649	$ 60,923	$ 77,975
Total Fair Value	149,742
Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	9,904
Corporate Securities
Fair Value of Financial Instruments
Securities	88,651
Government Securities
Fair Value of Financial Instruments
Securities	51,187
Level 1
Fair Value of Financial Instruments
Total Fair Value	9,904
Level 1 | Money Market Funds
Fair Value of Financial Instruments
Money Market Funds	9,904
Level 2
Fair Value of Financial Instruments
Total Fair Value	139,838
Level 2 | Corporate Securities
Fair Value of Financial Instruments
Securities	88,651
Level 2 | Government Securities
Fair Value of Financial Instruments
Securities	$ 51,187

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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.

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